Solve the simultaneous equations
x + y = – 8
-X + 3y = – 12
T =
y =

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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