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

In a right triangle , the shorter leg is 6 less than the longer leg. The hypotenuse is 6 less than twice the shorter leg. Set up a quadratic equation and use it to determine the lenghth of the hypotenuse of the right triangle. 3(x+3)+6x-6
please help me slove this problem