Solution
y = 2x – 7
4 + y = 12

x = 15/2 (15 over 2)

y = 8

Step-by-step explanation:

there 3 different way to do this (substitution, Elimination and Matrix)

ill be showing substitution ( you use the answer of one of the variables and substitute it for the other questions variable)

4 + y = 12

y = 12 -4

y = 8

y = -2x - 7

8 = 2x - 7  

8 + 7 = 2x

15 = 2x

x = 15/2

hope this helped and made a little sense!

15

step-by-step explanation:

both equations and proportions are better.