Write the equation in slope-intercept form: y = mx + b
Identify m as the slope
Identify b as the y-intercept
If the equation is not in slope-intercept form, rearrange it to isolate y
For a graph, find the point where the line crosses the y-axis
The y-value of that point is the y-intercept
To find the slope from a graph, use two points on the line
Use the formula m = (y2 – y1) / (x2 – x1)
Simplify the fraction to get the slope
Check that the y-intercept is written as an ordered pair on the y-axis, then use its y-value