Solve the following system using matrices and give the value of y:
-3x-2=7
x-4y+5z = 11
4x +y-z=-15

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.