book Maths Puzzle Numerical Ability

Can someone tell me if this is right? What is the slope of the line that has the equation 4x + 2y =12? Is the right answer 2????? Please let me know?

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The combined area of a square and a rectangle is 64 square centimeters. The width of the rectangle is 2 centimeters more that the lenght of the square, and the length of the rectan John leaves his house at 7:30am. His sister,Mary leaves at 8:30am and tries to catch up with John. She is walking 2 km/h faster than him on the same route in the same direction.