Question 661385
x = angle
y = complement
z = supplement
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x+y = 90
x+z = 180
4z + 8y = 3(180)
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Solve for the supplement of y
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4(180-x) + 8y = 540
720 - 4x + 8y = 540
720 - 4(90-y) + 8y = 540
720 - 360 + 4y + 8y = 540
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12y = 180
y = 15 degrees
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y plus its supplement is 180
supplement = 180 - y = 180 - 15 = {{{highlight_green(165)}}} degrees
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