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OpenStudy (anonymous):
{Solving Systems Of Linear Equations by substitution} (please work out) x+y=90 x+3y=210
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OpenStudy (anonymous):
please help
OpenStudy (blurbendy):
the first equation is easy to solve for x or y, so just pick one. if you pick x, you find that x = 90 - y now just substitute this in for x in the second equation 90 - y +3y = 210 solve for y now.
OpenStudy (anonymous):
does y=60?
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