The variable x varies jointly with y and z. use x=2, y=4, z=1 to write an equation relating x, y
& z. then find the value of x when y = 2 and z = 4.

Equation is and when y=2 and z=4, x will be 4.

Step-by-step explanation:

Given:

x varies jointly with y and z.

It also means x is directly proportional to y and z.

From above values we can compute the equation as.

Hence the Equation is

Now y=2 and z=4 we get.

Hence when y=2 and z=4, x will be 4.

answer: the common difference is -0.10