Question

Alg2. find the coordinates of where the graph intersects, show substitution of both coordinates
x-2y=-4
3x+2y=12

Answer 1

Add first and second equations 4x=8
x=8/4=2, plug x=2 into 1st eq.
2-2y=-4
2+4=2y
2y=6
y=6/2=3
intersection (2,3)
To check plug into both eq-ns

Answer 2

1st 2-2*3=-4 True
2nd 3*2+2*3=12 True