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OpenStudy (anonymous):
use substitution to solve the systems 5x+2y=-18 2x+9=y
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OpenStudy (michele_laino):
please substitute y in your first equation with the value of your second equation, namely: \[5x+2(2x+9)=-18\]
OpenStudy (sweetburger):
the second value give in the system is already equivalent to y so just plug it into the top equation like this 5x + 2(2x+9) = -18
OpenStudy (michele_laino):
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