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OpenStudy (anonymous):
Solve by the sustitution method 7x-8y=2 3x+21=y
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hero (hero):
Solve each equation for y: y = 3x + 21 y = (2-7x)/-8 Set y = y (by substitution) Substitute each equation in for y: 3x+21 = (2-7x)/-8 Cross Multiply: -8(3x+21) = 1(2-7x) Distribute: -24x - 168 = 2 - 7x Continue Solving For x: -31x = 170 x = -170/31 Substitute x back into original equation to find y
hero (hero):
Did you figure out what y is?
OpenStudy (anonymous):
no
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