Hints: Finding the Equation of a Line

Given a graph

Complete the form y=mx+b (the slope-intercept form) by observing the graph.

y=____x+____

1. Find the slope by observing           

2.Find the y-intercept by observing                

3. Simplify the equation  where the line crosses the y-axis between any two points on the line.

Given the slope and a point or two points.

• When given the slope and a point. Use the point-slope form,       where m is the slope and the point is .

• When given two points.

1. Find the slope using .
2. Use the point-slope form,  where the slope is m and can be either point.

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©2002, Last Updated: June 15, 2007
El Centro College
Communications, Mathematics, Developmental Studies, and Teacher Preparation Division