Mathematics

The y-intercept is where a graph crosses the y-axis, which always happens when $x=0$. Rather than memorizing a rule, just substitute $x=0$ into the function—all the terms with $x$ vanish, leaving only the constant term. That constant is your y-intercept's y-coordinate, and the point itself always has the form $(0, c)$.

The y-intercept is where a graph crosses the y-axis, which always happens when $x=0$. Rather than memorizing a rule, just substitute $x=0$ into the function—all the terms with $x$ vanish, leaving only the constant term. That constant is your y-intercept's y-coordinate, and the point itself always has the form $(0, c)$.