When using substitution, choose the best choice that describes a possible first step in solving the following system of equations.
3x – 6y = -12
2x + y = 12
A. ADD (y) to both sides in the bottom equation
B. MULTIPLY the top equation by (-6)
C. SUBTRACT (2x) from both sides in the bottom equation
D. DIVIDE the top equation by (3)
E. SUBTRACT (-6y) to both sides of the top equation

C. SUBTRACT (2x) from both sides in the bottom equation

Step-by-step explanation:

Given

Required

The first step of a substitution method

In the second equation, notice that the coefficient of y is 1.

So, the first step is to make y the subject of the formula.

This is achieved by subtracting 2x from both sides of the equation.

Hence: (c) is true

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363