Y varies jointly as X and Z Y60 when X6 and Z5 Find Y when X

factor and simplify the alegence expression (x + 9)^-1/s - (x + 9)^-6/s Solve by making the approximate substitution x- 13 squareroot X + partial differential partial differential = 0

Solution

Y varies jointly as X and Z.

Y=60 when X=6 and Z=5.

Y = k(X*Z) where k is a constant

Find Y when X=5 and Z=4

Y2/Y1 = (X1Z1)/X2Z2

Y2 = 60[(6*5)/(5*4)]

= 60[ 30/20]

= 180/2 =90

Y = 90