How do I do proportional relationships

y = 5x + 17

step-by-step explanation:

a perpendicular line will be the opposite reciprocal slope of the given equation.   the slope given is -1/5 so the opposite reciprocal is 5

find b:

7 = 5 (-2) + b

7 = -10 + b

17 = b

write equation

y = 5x + 17

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step-by-step explanation:

it would rotate about 180 degrees.

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce