Answer:
x = -3 ; y = -5
Step-by-step explanation:
x +y= -8. (1)
...
-x +3y= -12. (2)
from equation (1) make y subject
y= -8 - x. (3)
put y = -8 - x in (2)
-x + 3(-8 -x) = -12
-x -24 -3x = -12
-x -3x = -12+24
-4x =12
x= -3
substitute x= -3 in (3)
y= -8 -(-3)
y= -8+3
y=-5
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