Question

X - Y = 6 x + y = -7 s= {(-1/2, -13/2)}

Answer 1

x - y = 6
x + y = - 7
2x = -1
x = -1/2

x + y = -7
- 1/2 + y = -7
y = - 7 + 1/2
y = -14/3 + 1/2
y = -13/2