Slope-intercept form writes a line as y equals mx plus b, where m is the slope and b is the y-intercept. Its usefulness is that both of those are readable straight off the equation with no rearranging.
Math Dictionary / Slope-Intercept Form
Slope-Intercept Form
Slope-intercept form is the linear equation form y = mx + b.
AlgebraGrade 8Algebra 1GEDSATACT
What it means
In this form, m is the slope and b is the y-intercept.
Also called: y equals mx plus b
Examples
| y = 2x + 5 has slope 2 and y-intercept 5 |
| y = -3x + 1 is in slope-intercept form |
| The graph is a line |
Common mistake
The number beside x is the slope; the constant is the y-intercept.
Try one
Question: What is the slope of y = 4x – 7?
Show answer
4.