Question

solve each system by graphing.
y = x -3
x - 2y = 4

Answer 1

2 and -1

Answer 2

graph both, they will insersect at (2, -1)

Answer 3

Ok, the first equation should be simple to graph. For every 1 increase of Y, X will decrease by three. Plot that.
For the next equation I would rearrange to make plotting easier. It rearranges to 2Y=X-4. So for every 2 increase of Y, X will decrease by four. Plot this.
Where the two intersect is the answer. (2,-1) or X=2, Y=-1