If y varies jointly with x and z, and y = 200 when x = 8 and z = 10, what is x when y = 165 and z = 11? what is the value of k?

The answer is 2.5

The next blank is 6

Joint variation states:

if y varies jointly with x and z

then the equation we get;

where, k is the constant of variation.

As per the statement:

If y varies jointly with x and z

Using above definition we have;

⇒       ....[1]

y = 200 when x = 8 and z = 10

Substitute these value in [1]  to solve for k;

⇒

Divide both sides by 80 we have;

2.5 = k

or

k = 2.5

then we get an equation:

We have to find x when y = 165 and z = 11.

then;

⇒

Divide both sides by 27.5 we have;

6 = x

or

x = 6

Therefore, the value of k = 2.5  and value of x is 6 when  y = 165 and z = 11.

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step-by-step explanation:

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363