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OpenStudy (anonymous):
substitution method {x+y=10 { y=4x
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OpenStudy (anonymous):
For one moment, I thought this was a programming question. Substitute y=4x into x+y=10 to get x+4x=10. Simplify this and you obtain 5x=10, which is the same thing as x=2. Now, plug this into the second equation to solve for y and you get y=8.
OpenStudy (anonymous):
Therefore, the only point which satisfies this system is (2, 8).
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