The constant of variation k is
the value of z is

the variable z varies jointly with x and y. if z = 18 when x = 2 and y = 6, find the constant of variation, k, and then find the value of z when x = −4 and y = 5.

Step-by-step explanation:

Z ∞ XY

Z = KXY

K is the constant of proportionality

If z = 18 when x = 2 and y = 6, find the constant of variation, k,

K = Z/XY

K = 18/(2×6)

K = 18/12

K = 3/2

K = 1.5

Z = 1.5XY

find the value of z when x = −4 and y = 5.

Z = 1.5 (-4×5)

Z = -30

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e