Question

Identify which of the following functions is proportional.(1 point)
Responses

y=12x
y equals Start Fraction 1 over 2 End Fraction x

y=12x
y equals Start Fraction 1 over 2 x End Fraction

y=x2
y equals x squared

y=x+12

Answer 1

Proportional functions are of the form y = kx (a constant k, passing through the origin). So the proportional ones are:

- y = 12x
- y = (1/2)x

y = x^2 and y = x + 12 are not proportional (x^2 is not linear in x; x+12 has a nonzero intercept).