Inverse proportional

The total time taken (t) is inversely proportional to the number builders for example the more builders, the quicker the job.

We write;
f ∝ 1/n

To find the constant value we simply multiply t with n that is;

k = t x n

If k = t x n that must mean that the formula to find the other values becomes;
t = k/n

The same applies for inversely proportional to the square problems for example, y is inversely proportional to x²

y = 2 when x = 5 what is y when x = 4?

…first find the link between y and x² we know y ∝ 1/x², this must mean that y x x² = k. k is the constant.

k = 2 x 5²
= 2 x 25
= 50.

If y x x² = 50 then the formula is;

y = 50/x²

…second step is to use the formula to find y when x = 4.

y = 50/x²
y = 50/4²
y = 3.125