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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 first equation? 9 - x y - 9/2 9 - 2y 1/2 y + 9
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OpenStudy (anonymous):
get x by itself in the first equation
OpenStudy (anonymous):
Re-write the second equation as x = y + 6. Now plug it into the first equation.
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