

Write an equation that expresses the following relationship. y varies directly as x and inversely as the square of z.
Solution:
We will use the concept of direct proportion and indirect proportion to write the required equation.
It is given that y varies directly as x and inversely as the square of z.
So, directly proportional means that when x increases y should increase, and when x decreases y should also decrease in the same ratio
Hence we can write, y ∝ x ----- ( 1)
Also indirectly proportional that when z increases then y should decrease and when z decreases then y should increase. Here it is given that y is inversely proportional to the square of z.
Hence, y ∝ 1/z2 .----- (2)
On combining equation 1 and 2 we get,
y ∝ x / z2
A constant k comes on the removal of the proportionality sign
Therefore required equation = kx / z2
Hence,The equation y = (kx/z2) expresses the relationship, y varies directly as x and inversely as the square of z.
Write an equation that expresses the following relationship. y varies directly as x and inversely as the square of z.
Summary:
Equation y = (k x / z2) expresses the relationship, y varies directly as x and inversely as the square of z
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