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B1 of a trapezoid in which A 48x+68 in, h 8 in, and b2 9x+12 in

B1 of a trapezoid in which A 48x+68 in, h 8 in, and b2 9x+12 in-example-1
User Uclydde
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A=h(b1+b2)/2, so 48x+68=8(9x+12+b1)/2. Then, dividing by 4, 12x+17=9x+12+b1. Subtracting 9x+12, we have that b1=3x+5.
User Yina
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