Solve the system by graphing.?

Question

x – 2y = 8
x + y = –1

Answer 1

Transform both equations into y-intercept form

y = mx+b (where b is a numerical constant)

Then your solution will be the coordinates (x,y) were the two
lines you draw intersect.

Answer 2

well, solve for y, and you get
y= 1/2x - 4 and y= - x -1
so the first one has y-intercept -4 and a slope of 1/2, so other points include (2,-3) and (4,-2)
the second one has y-intercept -1 and a slope of -1, so points include (-1,-2) and (-2,-3).
the point of intersection would be (2,-3)