Question

Use the elimination method.
x-y=-7
-2x-y=8

Answer 1

Answer:

Step-by-step explanation:

x - y = -7     ----------- [ 1 ]

-2x - y = 8 ----------- [ 2 ]

Eliminate y by  equation [ 2 ] - [ 1 ]:

( -2x - y) - (x - y) = 8 - (-7)

-2x - y - x + y = 15

-3x = 15

x = -5

Sub x = -5 into equation [ 1 ] to find x :

x - y = -7

-5 - y = -7

-y = -2

y = 2

Answer: x = -5, y = 2

Answer 2

by using elimination method
x-y=-7*-2
-2x-y=8*1
-> -2x+2y=14
-2x-y. =8
+ + -
=>3y= 6
y=2
now put value of y in x-y= -7
x-2=-7
x=-7+2
x=-5