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OpenStudy (anonymous):
Solve the system of following linear equations by addition: -4x+y=-4 8x+y=20
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OpenStudy (rulnick):
from first eqn: y=4x-4 subst in second eqn: 8x+4x-4=20 solve 12x=24 x=2 back substitute to get y: y=4(2)-4 = 4. So x=2, y=4. Done.
OpenStudy (anonymous):
Where did you get the equation to back substitute in?
OpenStudy (rulnick):
y=4x-4 with x=2
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