Build the slope-intercept equation of a line from a slope and a point. Enter the slope and a point on the line.
Usage Tip
The y-intercept is where x = 0; the x-intercept is where y = 0. Set the other variable to zero and solve.
b = y − m×x at any known point
From a slope and any point, b is found directly.
The y-intercept and x-intercept are computed.
A slope of zero gives a horizontal line.
Slope-intercept form writes a line as y = mx + b, where m is the slope and b is the y value where the line crosses the y axis. When you know the slope and one point on the line, the intercept follows from b = y – mx using the coordinates of that point.
The slope tells you how much y changes for each unit of x: positive slopes rise to the right, negative slopes fall, and a slope of zero gives a horizontal line. A vertical line has an undefined slope and cannot be written in this form. Check your answer by substituting the original point back into the finished equation.