Suppose y varies jointly as x and z. Find y when x=-9 and z=23, if y=117 when x=-3 and z=-11. Round your answer to the nearest hundredth, if necessary. Select one:

The value of y given the values of x and z in the question is - 734.85

Step-by-step explanation:

This is a joint variation question.

First, we are made to know that y varies jointly as x and z.

The equation for this can be written as;

y = k * x * z

Where k is the constant of proportionality.

Let's calculate k first.

117 = k * (-3) * (-11)

33k = 117

K = 117/33 = 3.55

Now, we proceed to get what y is when x = - 9 and z = 23

Let's plug these values into the initial equation written.

y = k * x * z

We use the value of k calculated above;

y = 3.55 * (-9) * (23) = - 734.85

-733.909

Step-by-step explanation:

To find the answer to this question, we need to know the constant of variation.

The procedure to get the values is

Y ∞ X * Z

Y = k*x*z

When y = 117, x = - 3 and z = - 11

Put this values in that equation above and we have the value of X

117 = - 11 * - 3 * k

117 = 33k

K = 117/33

K = 3.545

Now that we have the constant of variation needed to get the value of either y, x or z whenever we have 2 other figures

So when x = - 9 and z = 23

Y = - 9 * 23 * 3.545

Y = - 733.909