5x-3y=3

2x-4y=-10
3x+y=(?)

a. -30
b. -13
c. -7
d. 7
e. 13

please answer and explain

4 answers

since the solution to the first two equations is
x=3
y=4
you should have no trouble evaluating 3x+y
3(3)+4
9+4
13

answer e

thank you, Steve
but could you tell me how to solution the first two equation
substitution or elimination will work fine. Time to review your tools for solving systems of equations.