Question

If y varies jointly as x and z, and y = 20, x = 2, and z = 5, then find k, the constant of variation.

Answer 1

is it directly or inversely ??

Answer 2

i think it's directly

Answer 3

so \[y \alpha (x) (z) = y = K (x) (z)\]

put all the values..

20 = k (2) (5)
K = 2...