20 : 0.75 = 40 : 1.5 = 80 : 3
$64.79 would be the cost after tax is added
Answer: The rule is when rotating 90 degrees, it's (-y, x), 180 degrees is (-x, -y), and 360 degrees is (y, -x). Just plug in the numbers accordingly, and you should get the correct answer. It worked for me <3.
Those are the answers
2x-2
6x+9
7x+35
10x-5y