Question

Solve the system of equations by substitution.

2x + y = 3z

x + y = 6z


What is the value for y from the first equation, that could be substituted into the second equation?


A. -2x +3z

B. 3z + 2x

C. -2x - 3z

D. 2x + 3z

Answer 1

Answer is A. -2x + 3z
Reason
2x + y = 3z
If you subtract 2x from both sides to isolate “y”
2x -2x +y = -2x + 3z
Now combine like terms
You get
y= -2x + 3z
Problem solved