Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

option d.

Step-by-step explanation:

If y varies directly as x and z, the form of the equation is:

Where k is the constant of variation.

If y=4 when x=6 and z=1 then substitute these values into the expression and solve for k:

Substitute the value of k  into the expression. Then, the equation is:

To find the value of y when x=7 and z=4, you must substute these values into the equation. Therefore you obtain:

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