let's say the bill without the tip is "x" amount, so that'd be the 100% of the bill, but we also know that 4.50 is the 18% of "x".
so if 4.50 is the 18% of "x", how much is "x"?
Reflect the point (a) in the x-axis and (b) in the y-axis (4,5)and (1 1/2, -1/4)
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