Objective:

To use points to find the slope of the line.

Vocabulary:

Notes:

Slopes:

When looking at the line going from left to right (like you read): Note that zero slope and no slope are NOT the same thing!

Slope Formula:

n 1

Hint:

An easy way to remember this is to think of skiing:

Examples:

  1. Ex 1Locate two places where the line crosses grid intersections.

    I see four in this graph:  (−3, 6), (0, 4), (3, 2), & (6, 0).

    Substitute the x and y values from two of these points into the slope formula and solve.

    Be careful with the signs, this is where most mistakes are made.

    Ex 1

    It doesn't matter which two points you use.  Using the last two points gives you the same answer.
    Ex 1
  2. Ex 2Locate two places where the line crosses grid intersections.

    I see five in this graph:  (−4, −3), (−3, −1), (−2, 1), (−1, 3) & (0,5).

    Substitute the x and y values from two of these points into the slope formula and solve.

    Be careful with the signs, this is where most mistakes are made.

    Ex 2

    It doesn't matter which two points you use.  Using the last two points gives you the same answer.
    Ex 2

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This page was last updated on 08/09/13.