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You need to determine another point along the line or determine the slope of the line given the graph.

First, count the "rise" and "run" units along the graphs. To count the "rise" units, count the number of units it takes for the line to rise up. To count the "run" units, count the number of units it takes for the line to run left/right.

Remember:

  • If you are running up along the line, then you are counting positive units for the "rise".
  • If you are running left/right along the line, then you are counting negative/positive units for the "run".

Use this simplified form:

m = slope form = rise / run

Then, use the point-slope form to determine the equation of a line.

y - y0 = m(x - x0)

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Q: How do you find equations of a line given a point and line?
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