Answer
x = 12, y = 5
x = -13, y = -20
Step by step explanation:
You have two equations, and you have to find a way to merge them.
x - y = 7 —— {1}
From {1}, y = x - 7 —— {2}
x² + y = 149 —— {3}
Rep {2} in {3}
x² + y = 149
x² + (x-7) = 149
x² + x - 156 = 0
(x-12) (x+13) = 0
x = 12 and x = - 13
When x = 12, y = 12 - 7 = 5
(12, 5)
When x = - 13, y = - 13 - 7 = - 20
(-13, - 20)