Question 90427
x – 2y = 8
x + y = –1

Since the answer must satisfy both equations, the answer must be
the interception point of two graphs.

see graph below


{{{graph(200,200, -5, 5, -5, 5, 0.5*x-4, -1-x)}}}

from the graph we can see interception point is (2, -3)

so the answer is x = 2, y = -3