The distance formula is
. In the ordered pair (4, 6), 4 is the <em /><em>x</em>-coordinate and 6 is the <em /><em>y</em>-coordinate. In the ordered pair (7, -3), 7 is the <em>x</em>-coordinate and -3 is the <em>y</em>-coordinate. Substituting those values in gives us
. Since subtracting a negative is the same as adding a positive, we now have
What is the sales tax rate if a $7,594 purchase will have $569.55 of sales tax added to it?
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