Question

Identify the first step using the elimination method to solve the following system of equations:
10x - 7y = -18
15x + 3y = 27
A. 7(10x - 7y = -18) 3(15x + 3y = 27)
B. 15(10x - 7y = -18) 10(15x + 3y = 27)
C. -3(10x - 7y = -18) 2(15x + 3y = 27)
D. 27(10x - 7y = -18) 18(15x + 3y = 2

Answer 1

first step for elimination, is to get the coefficient of x, or coefficient of y to be the same value

Answer 2

look through your given answers, multiply out the brackets
and see which one gives you a coefficient of x to be the same in both equations, or the same coefficient of y to be the same

Answer 3

if I had

2x+y=3
x+3y=4

I would multiply my second equation by 2 to get the same x coefficient which would give me

2x+6y=8