Question

If y varies jointly as x and z, and y = 36 when x = 9 and z = 12, find y when x = 18 and z = 21.

Answer 1

y = 126

Explanation:

first find the constant K

y=kxz

126= K x 9 x 12

k = 1/3

then subs the value of k

y= kxz

y= 1/3 x 18 x 21

y = 126