Check the picture below.
using a second for it, since it's a horizontal line, then say hmmm we'll use the y-intercept, or (0, 1), so the equation of a line that passes through (2,1) and (0,1)
100$ because the income you have to earn is 400$, right? If so then 100 * 4 give you 400.
Multiply 7 by 0.08 and you get $0.56. $0.56 is the tax. For other tax questions just multiply the price and the sales tax as the decimal.
F(x) = x + 8
This is because you are simply moving the y-intercept up 8 units.
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