exam Maths Puzzle Numerical Ability

The perimeter of a rectangle is 114 ft.Its length is 3 more than 2x its width.Find the dimensions of the rectangle.

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Could ssomeone please explain how to work this problem?
Find the slope and y intercept by writing the equation in slope intercept form then graph the equation. 3x+y=-2 This problem is from the "Cracking the New SAT" from Princeton Review, on page 209, from the heading "solving rational equations":((((6x7+9x4)/(2x6+6x2)=54))) Note: the answer is