Question

Which is an equation of a direct proportion? CLEAR CHECK y=8x y=12x+4 y=12x y=4x−4

Answer 1

Answer:

$y=8x, \\y=12x$

Step-by-step explanation:

Proportional functions can be written as $y=kx$, where $k$ is some constant of proportional. Since directly proportional functions always pass through the origin, the y-intercept must be 0 (no additional number before or after $x$ term). The only answers that fit this format are:

$\rightarrow \boxed{y=8x}\\\rightarrow \boxed{y=12x}$