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OpenStudy (anonymous):
Solve the system x - y = 3 and 3x - 8y = 9. What is the value of y?
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OpenStudy (anonymous):
My last question guys! Promise!!
OpenStudy (anonymous):
x = y + 3 plug this in for x into the other equation
hero (hero):
x - y = 3 3x - 8y = 9 x -3 = y 3x - 9 = 8y y = x - 3 y = (3x-9)/8 y = y 8(x-3) = 3x-9 8x - 24 = 3x - 9 8x - 3x = 24 - 9 5x = 15 x = 15/5 x = 3 y = 0
hero (hero):
(x,y) = (3,0)
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