# How to find y-intercept given y = 4x?

The y-intercept is the value of $y$ where a given function crosses the y-axis. At all points along the y-axis, $x = 0$
Simply inserting $0$ for $x$ in the function definition supplies the y-intercept value
$y = 4 x \text{ at "x=0}$
$\rightarrow y = 4 \left(0\right) = 0$
The y-intercept is $0$