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Apr 13th, 2004, 01:24 AM
#1
Thread Starter
Dazed Member
Solving systems of linear equations?
Hello. Can anyone tell me how to go about solving two equations
simultaneously. Such as. a - b = 1, a/3 + b/5 = 1. The second equation is a fractional equation so i thought the correct process was to multiply the denoms by a number that both can divide into evenly.
(15/1)a/3 + (15/1)b/5 = 1(15/1) --> 5a + 3b = 15
Now take the first equation equation. a - b = 1 and multiply by -5 to drop one variable. -5(a - b = 1) --> -5a + 5b = -5
Now i end up with two equations --> 3b = 15, 5b = -5
Add the cofficents 8b = 10 --> 8b/8 = 10/8 --> b = 5/4
So if i plug in 5/4 into the first equation a - b = 1 --> a - 5/4 = 1
--> a = 5/4 + 1 --> a = 9/4
I guess i was on the right track.
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