Given: y varies jointly as x and z, and y = 16 when x = 1/2 and z = 8. What equation represents the joint variation function?
A. y = 4x/z
B. y = 4x
C. y = 1/4xz
D. y = 4xz
y = k*(xz) where k = constant 16=k*(1/2*8) 16 =k*4 k = 4. Therefore: y =4xz. Or D.
