Answer:
- 7x + y = -30
2x - 5 = y
=> -7x + 2x - 5 = -30
<=> -5x = -25
<=> x = 5
y = 2.5 - 5 = 5
=> (x,y) = (5;5)
y=7x-30
2x-5=7x-30
30-5=7x-2x
25=5x
x=5
if x = 5 substitute in any of the equations
y= 2*5 -5
y=5
