$30.22 received back
120 x .80 = $96 (shoes with discount no tax)
24 x .85 = $20.40 (one pair of shorts not tax)
20.4 x 3 = $61.20 (all shorts)
61.2 + 96 = $157.2 (shorts and shoes no tax)
157.2 x 1.08 = $169.776 (round to $169.78)
200 - 169.78 = $30.22 back from cashier
So, the answer to the equation is n=-15
Sales tax on food = total cost of food x sales tax = $16 x 5.75% = $0.92
Bill after tax = total cost of food + sales tax on food = $16 + $0.92 = $16.92
Tip owned = total cost of food x tip in percent = $16 x 0.1 = $1.60
Total bill = bill after tax + tip owed = $16.92 + $1.60 = $18.52
y = mx + b
The product of slopes of perpendicular lines is -1. The slope of the given line is 2, so the slope of the perpendicular line is -1/2.
y = (-1/2)x + b
Now use the given point to find b and finish from here.
-5 = (-1/2)(2) + b
b = ?
