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Linear Algebra
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OpenStudy (anonymous):
x + 2y = 30 3x + 8y = 108
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OpenStudy (anonymous):
I need to find x then plug it in to find y
OpenStudy (kc_kennylau):
(1)*4: 4x+8y=120 ---(3) (3)-(2): x=12
OpenStudy (anonymous):
How did you do that?
OpenStudy (kc_kennylau):
I multiplied the first equation by 4.
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