Question

Elimination of x-y=11 2x+y=19

Answer 1

Ggeasy

we can eliminate the y terms by adding the equations

x-y=11
2x+y=19 +
3x+0y=30

3x=30
divide by 3
x=10

subb ack
x-y=11
10-y=11
minus 10 both sides
-y=1
times -1
y=-1

(x,y)
(10,-1)