5x-2y=-5
y-5x=3
I understand how to solve by addition, what is different about doing it by subtraction?
2006-10-18 09:01:03 · 3 answers · asked by Ash1227 2 in Science & Mathematics ➔ Mathematics
5x-2y=-5
y-5x=3
5x - 2y = -5
-5x + y = 3
This problem, because of the 5x and the -5x, lends itself to solution by adding. However, if you had
5x - 2y = -5
5x + y = 3
you would subtract the equations. Essentially, there is no real difference between solving by addition and solving by subtraction - use whatever approach gives one equation in one unknown as the next step.
2006-10-18 09:12:08 · answer #1 · answered by Anonymous · 0⤊ 0⤋
5x-2y=-5
y-5x=3
instead of adding equations to eliminate a variable, you subtract 1 from the other. In this case, both variables have opposite signs in the 2 equations, so you would definitely want to add.
2006-10-18 16:29:07 · answer #2 · answered by yupchagee 7 · 0⤊ 0⤋
It is the opposite of adding . Subtract to find the answer.
2006-10-18 16:06:09 · answer #3 · answered by Antizzle 2 · 0⤊ 0⤋