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OpenStudy (anonymous):
3x-7y=29 & 3x+7y=1
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OpenStudy (anonymous):
Add the two equations togehter
OpenStudy (anonymous):
3x-7y=29 3x+7y=1 -3(3x-7y=29) 3(3x+7y=1) -9x+21y=-87 9x+21y=3 42y=-84 y=-84/42 y=-2 3x+7y=1 3x+7(-2)=1 3x -14=1 3x=14 +1 3x=15 x=15/3 x=5
OpenStudy (anonymous):
so 3x+3x -7y+7y 29+1
OpenStudy (anonymous):
good luck with your hw
OpenStudy (anonymous):
the y variables disappear, so it leaves you with 6x=30 x=5
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OpenStudy (anonymous):
then put 5 into one of the equations to get y=-2
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