Direct proportion

A relationship of the form $y=kx$, where the ratio $\frac{y}{x}$ is constant and the graph passes through the origin.

A relationship in which one variable is a constant multiple of another, so it can be written in the form $y=kx$.

A relationship in which one quantity is a constant multiple of another: $y=kx$.

A relationship in which one variable is a constant multiple of another, so it can be written in the form $y=kx$.

A relationship of the form $y=kx$, where the ratio $y/x$ is constant.

A relationship in which two quantities are connected by a constant multiplier, so multiplying one quantity by a scale factor multiplies the other by the same factor.

A relationship in which one quantity is always a fixed multiple of another, so their ratio is constant.

A relationship in which one quantity is a constant multiple of a stated expression involving another quantity.