To fill: The equation relating to z for the given conditions.
The quantities are related by equation .
z is proportional to the product of x and y and z is 10 when x is 4 and y is 5.
If the quantities and are related by an equation,
For some constant , we say that is proportional to the product of x and y. The constant is called the constant of proportionality.
It is given that z is proportional to the product of x and y.
Compare the above equation with the definition of proportionality in equation(1).
Substitute 10 for z, 4 for x and 5 for y in equation (2).
Simplify the above equation to find the value of k.
Substitute the value of k in equation (2)
Therefore, the quantities are related by equation .
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