Solve using elimination method

X+2y=-1

X-y=8

x+2y=_1

x_y=8

multiplay number infornt of y each sides

_x + 2y=1

2x_ 2y=16

x=17

Answer: x=5 and y = - 3

Explanation:

x + 2y = - 1

x - y = 8

change the signs of the second equation (-x + y = - 8)

x + 2y = - 1

-x + y = - 8

add this up (as x cancels out u should get) 3y = - 9

y = - 3

substitute this (x + 2 (-3) = - 1)

x + (-6) = - 1

x = + 6 - 1

x=5