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OpenStudy (anonymous):
Hi! Can anybody help me with this solution problem? 9x+3y=15 3x=5-y
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OpenStudy (anonymous):
By substitution or addition?
OpenStudy (anonymous):
Sorry Thats addition
OpenStudy (anonymous):
Okay. First lets rewrite the second equation as 3x + y = 5. If we multiply the second equation by -3, we get -9x - 3y = -15. Adding to two together 9x + 3y = 15 -9x - 3y = -15 We see that everything equals zero. This means both equations are linearly dependent. In other words, they are the same equation.
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