Physics - Calculus Question with Solution | TestHub

A straight line can be represented by the equation $y=mx+c$, where $m$ is the slope and $c$ is the y-intercept. For a line to pass through the origin $(0,0)$, the y-intercept $c$ must be zero.

Among the given options, only $y=3x$ is of the form $y=mx$ (with $m=3$ and $c=0$), which represents a straight line passing through the origin.