In order to solve the following system of equations by subtraction could you do before subtracting the equation so that one variable will be eliminated when you subtract them 4x-2y7 3x-3y15?

Answer 1

Given 4 x - 2y = 7

And 3x - 3y = 15

Or simplified as x - y = 5 (dividing by 3)

Now multiply by 2 and you get 2 x - 2y = 10

Here subtraction makes y eliminated

So subtracting 2 x = - 3

==> x = -3/2

Plugging we get y = -13/2