X-intercept

intercepts

The x-intercept is the x-coordinate of the point at which a line intersects the x-axis. If the line is represented in the point-slope form, i.e., $y=m\cdot x+b$ and $m\neq 0$, then the x-intercept is $-b/m$. if $m=0$, the line doesn't cross the x-axis (case $b\neq 0$) - so there is no intersection, or the line is identical to the x-axis (case $b=0$).

See also: y-intercept