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OpenStudy (anonymous):
Solving Systems of Equations by Substitution. -4x + y = 6 -5y - y =21
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OpenStudy (anonymous):
-4x = 6 -y x = 3/2 + y/4 ( u make x the subject of the formula in first equation)
sam (.sam.):
-4x + y = 6 .......multiply -1 -5x - y =21 4x - y = -6 -5x - y =21 ---------------- 9x =-27 x=-3 ===================== -4x+y=6 -4(-3)+y=6 y=-6
OpenStudy (anonymous):
is ur qn written correctly
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