Mathematics for IGCSE & O level - Proportion (Section 2 - No. 26)

If *y* varies inversely as *x*, and *y* = 4 when *x* = 3, what is the formula connecting *x* and *y*?

y = 12x

y = \(\frac{12}{x}\)

y = \(\frac{x}{12}\)

y = 4x + 3

For inverse proportion, the formula is y = k/x. Use the given values to find k, which is 12. So, y = 12/x.