Question

11x-y=21
9x+2y=-11

solving by subtitution plss help

Answer 1

you want to take away the y’s in each equation so you are left with the x’s for now

2(11x - y = 21) = 22x - 2y = 42

you are going add both equations to get:

31x = 31
x = 1

now substitute 1 into one equation

(9*1) + 2y = -11
9 + 2y = -11
2y = -20
y = -10

x = 1
y = -10