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OpenStudy (anonymous):
solve by substitution −2x−y=−9 5x−2y=18
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OpenStudy (anonymous):
from (1) we get 5x-2(-2x+9)=18 9x=36 x=4
OpenStudy (anonymous):
y=1
OpenStudy (anonymous):
y = 9-2x substitute to 5x-2y=18 5x-2(9-2x)=18 5x+4x-18=18 9x=36 x=4 substitute to y =9-2x y=9-2(4) =1
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