Sal chose to make each step explicit to avoid losing people. That was the original version of the second equation that we later transformed into this. Which equation is correctly rewritten to solve for - Gauthmath. If you divided just straight up by 16, you would've gone straight to 5/4. 15 and 70, plus 35, is equal to 105. And now we can substitute back into either of these equations to figure out what y must be equal to. And I said we want to do this using elimination. That was the whole point behind multiplying this by negative 5.
I noticed at6:55that Sal does something that I don't do - he sometimes multiplies one of the equations with a negative number just so that he can eliminate a variable by adding the two equations, while I don't care if I have to add or subtract the equations. So let's pick a variable to eliminate. Which equation is correctly rewritten to solve for x 19 1. That is, these are the values of that will cause the equation to be undefined. How many solutions does the equation below have?
So let's say that we have an equation, 5x minus 10y is equal to 15. So y is equal to 5/4. So x is equal to 5/4 as well. The constants are the numbers alone with no variables. Solve the equation: Notice that the end value is a negative. Which equation is correctly rewritten to solve for x a. b. c. d. And you could literally pick on one of the variables or another. And then negative 5 times negative 2y is plus 10y, is equal to 3 times negative 5 is negative 15. Since the least common denominator of,, and is, we can mulitply each term by the LCD to cancel out the denominators and reduce the equation to. To solve for x, we make x subject of the formula. The same thing as dividing by 7. So if you looked at it as a graph, it'd be 5/4 comma 5/4. You can say let's eliminate the y's first. These lines are parallel; they cannot intersect.
And let's see, if you divide the numerator and the denominator by 8-- actually you could probably do 16. If we add this to the left-hand side of the yellow equation, and we add the negative 15 to the right-hand side of the yellow equation, we are adding the same thing to both sides of the equation. The left-hand side just becomes a 7x. And so what I need to do is massage one or both of these equations in a way that these guys have the same coefficients, or their coefficients are the negatives of each other, so that when I add the left-hand sides, they're going to eliminate each other. Solve: First factorize the numerator. Now once again, if you just added or subtracted both the left-hand sides, you're not going to eliminate any variables. Well he wanted at least one term with a variable in each equation to be the same size but opposite in sign. Divide each term in by. I know, I know, you want to know why he decided to do that. Dividing both sides of the equation by the constant, we obtain an answer of. Which equation is correctly rewritten to solve for x 1 0. This is just personal preference, right? Feedback from students.
Subtract one on both sides. And we have 7-- let me do another color-- 7x minus 3y is equal to 5. But the first thing you might say, hey, Sal, you know, with elimination, you were subtracting the left-hand side of one equation from another, or adding the two, and then adding the two right-hand sides. The original equation over here was 3x minus 2y is equal to 3. How to find out when an equation has no solution - Algebra 1. Divide both sides by negative 10. On the left hand side of the equation, the q numerator will cancel the q denominator, leaving us with only x). All Algebra 1 Resources. Remember, we're not fundamentally changing the equation.
The negatives cancel out.
Yes, it's an emission thing. CWKONABG Altering from 5>1 is required (Explanation below). Zarboz, have you done this to your 540 yet? Secondary air pump delete e46 1. Long explanation below: By the bit B slsfz from CWKONABG the catalyst heating concept without / with secondary air system becomes compatible: B slsfz = | 0: no secondary air system, lean catalyst heating operation of the engine | 1: with secondary air system, rich catalyst heating operation of the engine Further possible secondary air variations are described in%SLS. There's no real harm in deleting it if you block it off properly and code it out correctly (which plenty of reputable tuners like DUDMD will do as part of a tune). Or Lambda engine default selection by code word CWSLS in%SLS analogues to lean warm-up. I simply unplug the relay to the SAP air pump.
Euro byte for Secondary Air pump = 0. Richer dependent on load (rl) when starting from rest and adjustment to the lean performance limit (lalgm) from%ESWL, as described in%LAMKO. Last edited by 16valex; 05-03-2019 at 01:44 PM. Glad my LS3 doesn't have CAT's or an air pump. What am I doing to my motor. Golden Gate Chapter BMW CCA Nr 62319. Secondary air pump delete e46 how to. OK so you're probably wondering whats going on right? Your not that far from Pikes Peak, take it up there and let it sit for a few hours and see how it starts. SO I had to 00 out other items in order to get the SAP system to truly be "deleted" from the cars ecu functions. With the normal A/F about the only negative I can think of other than possible CAT issues would be the back sides of the exhaust valves may get more carbon deposits on them.
I have been driving with the relay removed for 4-5 years. Switching off: No catalyst heating with MLSUS = 0 in%BBKHZ No Lambda action during lean warm-up: KFLMSKH = 1 with secondary air: MSLUB = 0 in%SLS and KFLASKH = 1. To get my SAP code to not be thrown on the dash anymore I did the following: This yielded me no error for SAP activation (it is unplugged and block plated off now) and I get no error after cold start for SAP. I don't see any cold start problems but as my car has a jag charger now and has had some fuelling changes I don't know how that has changed things. Merely unplugging the SAP and blocking it off is an option and would yield a check engine light amongst a few other problems that are not as aparrent until the functions of the DME are described. Lean warm-up: Default selection KFLMSKH with 1, 05, transition to 1, 0 resp. So zarboz must turn off the EXTRA richness for the SAP. 1999 540 Auto with Eaton M112 supercharger. Did you change the A/F on cold start? Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Rich warm-up: Default selection KFLASKH with 1, 1 to 1, 2, transition to > 1, 3 when starting from rest and adjustment to the lean performance limit (lalgm) from%ESWL, as described in%LAMKO.
I like to pretend I know stuff. 1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan. I have sufficiently coded the SAP out of the DME portion via the 64kb mapping tables myself a I have talked with a few dudes online in Russia who are familiar with our DME and all 4 of them gave me different methodologies and reasonings why the other guy was missing X function or why Y function was important to 00 out as well it was pretty easy to figure out once i had some data sheets.
Default selection in%ESWL such that "lalgm" does not limit lalgf during catalyst heating. Is this PURELY for emissions purposes? Then once a month read codes that are NOT SAP related. Maybe some on the tops of the pistons too. OBD2 scan shows no error for SAP either meaning I could pass emissions. The goal is to get the cats to work ASAP. This heats the CAT's up quicker along with the pre-CAT O2 sensors. The SAP is pretty much there to please the emissions people, that's why plenty of countries don't have em. The SAP helps burn the rich mixture that is used during a cold start. Must also help the bigger secondary CAT's too. The SAP interacts with lambda tables and timers as well as interacting with catalyst heaters and heating function. Cold startup fuel enrichment is separate from Cat-preheating enrichment. Some catalyst warming function during cold start.
They cannot handle that much extra fuel without air on short trips, maybe it will burn off on longer runs. If you don't it will ruin the cats. Thanks for that Danny / Jim. Takes a little extra key turn to get her on. I was more just curious what negatives I am looking at other than emissions and slower catlyst warming on cold start due to leaner fuel conditions.
Well I did the SAP delete on my 97-528 using a kit from someone here. I was speculating that this richness is purely during "warmup function" which i would imagine the SAP dumps air + Gas to the cats to get them up to operating temp as fast as possible in case of a cold start emissions test? This topic and associated thread explains a lot about it (for the e46 M3): When the car is started and the DME thinks the cats are cold, it will enable the SAP, inject extra fuel and retard the timing (and change some VANOS settings if applicable). Glad I don't have one! If it is enabled then it injects more fuel during startup routine to make cats reach operating temp faster.. the really long technical looking snippet right before my inquiry is a snippet from the software data guide.