Question

Solve each system by elimination

Answer 1

X-y=11
2x+y=19
add them


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

3x=30
divide 3
x=10

sub baack
x-y=11
10-y=11
minus 10
-y=1
times -1
y=-1


(x,y)
(10,-1)