$3.18 when the tax is applied to each bottle separately or at the end of the bill.
For parallel lines, slopes are equal.
5x - 3y = -10
3y = 5x + 10
y = 5/3 x + 10/3
Required slope = 5/3
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For the first one just do the multiplication as you do normally.
For the second one, you have to put a zero behind before calculating the numbers in front