The perimeter of rectangle ABCD is 42 cm and the area is 80 cm2. Which equation can be used to find the dimensions of the rectangle? (Hint: Set up a system of equations).
xy + 2x + 2y = (42) (80)
x^2 + 80x - 42 = 0
x^2 - 42x + 80 = 0
x^2 - 21x + 80 = 0
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