Question

Solve using elimination method

X+2y=-1
X-y=8

Answer 1

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

Answer 2

x+2y=_1

x_y=8

multiplay number infornt of y each sides

_x +2y=1

2x_ 2y=16

x=17

Explanation: