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OpenStudy (anonymous):
solve by elimination or substitution 2x-4y=18 and 3x+5y=-3
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hero (hero):
2x - 18 = 4y ---> y = (2x-18)/4 3x + 5y = -3 ---> y = (-3 - 3x)/5 y = y 5(2x - 18) = 4(-3 - 3x) 10x - 90 = -12 - 12x 10x + 12x = -12 + 90 22x = 78 x = 39/11
hero (hero):
y = -30/11
hero (hero):
you find y by plugging the x value back into one of the original equations
OpenStudy (anonymous):
thank you
hero (hero):
yw :D
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OpenStudy (anonymous):
how did you go from 22x = 78 to x = 39/11
hero (hero):
x = 78/22 x = 39/11 reduction by 2
OpenStudy (anonymous):
oh, wow. great
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