Question

Help please

Variable y varies directly with x2, and y = 75 when x = 5.

What is the value of y when x = 3?

Answer 1

If y varies directly with \(x^2\), then you can say:
\(y = kx^2\), \(k\) is proportionality constant..

Answer 2

\(y = kx^2\),
Now, \(y = 75\) when \(x = 5\), by using these details, find \(k\) first.

Answer 3

\(75 = k (5)^2\)
\(75 = k \times 25\)

Can you find \(k\) here? If so, then tell me.