exam Maths Puzzle Numerical Ability

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

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exam Other Question
Using the following sequence (-1,-5,-9,-13,...) find the function tn. The perimeter of a rectangle is 114 ft.Its length is 3 more than 2x its width.Find the dimensions of the rectangle.