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Every straight line can be represented by an equation: y = mx + b. The coordinates of every point on the line will solve the equation if you substitute them in the equation for x and y.

The slope m of this line - its steepness, or slant - can be calculated like this:
                       m = change in y-value
                                                   change in x-value

The equation of any straight line, called a linear equation, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept.

The y-intercept of this line is the value of y at the point where the line crosses the y axis.

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 ·  The coordinate plane

 ·  Slope and y-intercept

 ·  Graphing linear

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Slope and y-intercept