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Linear Algebra
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OpenStudy (anonymous):
x + y = 15 4x + 6y = 72
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OpenStudy (anonymous):
I need help again finding x then plugging it in to find y
OpenStudy (kc_kennylau):
Use Wolfram|Alpha
OpenStudy (kc_kennylau):
(1)*6: 6x+6y=90 ---(3) (3)-(2): 2x=18 --> x=9
OpenStudy (anonymous):
subtract y from both sides in the first equation and then substitute for x.
OpenStudy (kc_kennylau):
method of @AlexisEyvonne also works :)
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OpenStudy (anonymous):
I need help with another please :)
OpenStudy (anonymous):
3x + 2y = 475 x + 2y = 180
OpenStudy (kc_kennylau):
(1)-(2): 2x=295 --> x=147.5
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