Mathematics

The y-intercept is where a graph crosses the y-axis—that's always when $x=0$. Rather than graphing or doing complex algebra, just substitute $x=0$ directly into the function and simplify. All the terms with $x$ vanish, leaving only the constant term, which is your answer.

The y-intercept is where a graph crosses the y-axis—that's always when $x=0$. Rather than graphing or doing complex algebra, just substitute $x=0$ directly into the function and simplify. All the terms with $x$ vanish, leaving only the constant term, which is your answer.