Question

Identify which of the following functions is proportional. (1 point)
y = x^2
y = 0.5x
y = (1/2x)
y = x + 0.5

Answer 1

A proportional function has the form y = kx (a straight line through the origin). Only y = 0.5x is proportional (k = 0.5).

- y = x^2: not proportional (nonlinear).
- y = 1/(2x): inverse proportional, not proportional.
- y = x + 0.5: linear but not through the origin, so not proportional.