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Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Yvaries inversely as x. y =12 when x=5. find y when x=4

Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. y = x â’ 1 , y = 0, x = 5; about the x-axis v = sketch the region. sketch the solid, and a typical disk or washer.