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OpenStudy (anonymous):
When solving the system x+2y=9 and x-y=6, which expression could be substituted for x in the second equation?
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OpenStudy (anonymous):
A. 9-x B. y=9/2 C. 9-2y D. 1/2y+9
OpenStudy (anonymous):
Isolate x in the first equation, then substitute it into the second. x + 2 y = 9 x = 9 - 2y Plug that into the second equation for x and solve.
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