Aaron is calculating the difference (d) between the areas of two circles. if circle 1 has a radius of r, circle 2 has a radius of r, r> r, which of the following equations represents the difference between the areas?

a. d= π(r-r)^2
b. d= π(r^2-r^2)
c. d= π^2(r-r)
d. d= (πr-πr)^2

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y = (2/3)x - 3
3y = 2x - 9 ( multiplied both sides by 3)
-2x + 3y = -9 (subtracted 2x from both sides)
-2x + 3y + 9 = 0 (added 9 to both sides)
-2x + 3y + 9 = 0 is standard form of a straight line

if you prefer the coefficient of x to be positive, you can multiply the above by -1:
2x - 3y - 9 = 0 

Cdoes not have two variables