5x-3y=3

Question

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

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

please answer and explain

Answer 1

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

Answer 2

3(3)+4
9+4
13

answer e

thank you, Steve

Answer 3

but could you tell me how to solution the first two equation

Answer 4

substitution or elimination will work fine. Time to review your tools for solving systems of equations.