Identify what information is given: two points, one point and slope, or a graph
If given two points, find the slope using (m=frac{y_2-y_1}{x_2-x_1})
If given one point and slope, use the slope directly
Use point-slope form: (y-y_1=m(x-x_1))
If needed, convert to slope-intercept form: (y=mx+b)
Substitute a point into (y=mx+b) to solve for (b)
Write the final equation of the line
If the line is vertical, use (x=text{constant})
If the line is horizontal, use (y=text{constant})