Mathematics for IGCSE & O level - Proportion (Section 2 - No. 41)
Which equation represents the statement: *y* varies inversely as the square of *x*?
y = kx
y = k/x
y = kx^2
y = k/x^2
解释
The formula for inverse proportionality is y = k/x. The value of x can then be squared if the question asks to show it with an exponent.