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OpenStudy (anonymous):
Use the substitution method to solve the linear system. 4x+y=9 y=-7
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OpenStudy (anonymous):
Can you put in y as -7 into the first equation?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
Substitute y=-7 into the equation; 4x + (-7) = 9 rearrange for x; 4x = 9 + 7 => x = 16/4 => x=4
OpenStudy (amistre64):
4x+y=9 y=-7 4x+y=9 -y=7 -------- 4x = 16
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