Finite Math Examples

Find the Equation Using Point-Slope Formula
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Find the slope of the line between and using , which is the change of over the change of .
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Slope is equal to the change in over the change in , or rise over run.
The change in is equal to the difference in x-coordinates (also called run), and the change in is equal to the difference in y-coordinates (also called rise).
Substitute in the values of and into the equation to find the slope.
Simplify.
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Simplify the numerator.
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Multiply by .
Subtract from .
Simplify the denominator.
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Multiply by .
Subtract from .
Divide by .
Use the slope and one of the given points such as to substitute for and in the point-slope form , which is derived from the slope equation .
Solve for to get the equation.
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After finding the slope between the points, use point-slope form to set up the equation. Point-slope is derived from the equation for slope .
Multiply by .
Simplify the right side.
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Simplify the expression.
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Multiply by .
Multiply by .
Apply the distributive property.
Multiply by .
Move all terms not containing to the right side of the equation.
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Add to both sides of the equation.
Subtract from .
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