Question

You need to solve a system of equations. You decide to use the elimination method. Which of these is not allowed?

2x-3y=12 -x+2y=13
A. Multiply equation 1 by 2 and equation 2 by 3. Then add the new equations.
B. Multiply the left side of equation 2 by 2. Then subtract the result from equation 1
C. Multiply equation 2 by -2. Then add the result to equation 1.

Answer 1

(x,y) (29,15)

Explanation:

2x-3y=12 -x+2y=13

Rewrite the expression and simplify

2x-3y=13

12-x+2y=1

Multiply both sides

2x-3y=13

-2x+4y=2

Eliminate one variable by adding the equations

y=15

Substitute the value of y

-x+2*15=1

Solve the equation

x=29