## Intermediate Algebra (6th Edition)

To find an x-intercept, we must find the value of x that is associated with a y-coordinate of 0. Therefore, we must set $y=f(x)=0$ (recall that f(x)=y, and is a way to say that y is a function of x). We then solve for x to find the x-intercept. Example: $y=f(x)=x+4$ $0=x+4$ Subtract 4 from both sides. $x=-4$, so the x-intercept is (-4,0).