Answer:
x=7, y=-7
Step-by-step explanation:
3x – y = 28
3x + y = 14
Add the two equations together
3x – y = 28
3x + y = 14
---------------------
6x = 42
Divide by 6
6x/6 = 42/6
x = 7
3x – y = 28
3x + y = 14
Multiply the second equation by -1, then add
3x – y = 28
-3x - y = -14
-------------------
-2y=14
Divide by -2
-2y/-2 = 14/-2
y = -7
