Key idea For a graph y=f(x)y=f(x)y=f(x): x-intercept: y=0,y-intercept: x=0\text{$x$-intercept: } y=0,\qquad \text{$y$-intercept: } x=0x-intercept: y=0,y-intercept: x=0 For a line y=mx+cy=mx+cy=mx+c: y-intercept (0,c),x-intercept (−cm,0) (m≠0)\text{$y$-intercept }(0,c),\qquad \text{$x$-intercept }\left(-\frac{c}{m},0\right)\ (m\neq 0)y-intercept (0,c),x-intercept (−mc,0) (m=0)