exam Maths Puzzle Numerical Ability

find the value of Y so that the line through (-2,-1) and (10,y) is perpendicular to the line through (6,-2) and (5,7)

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exam Other Question

A piece of copper tubing 60 inches long is cut into two unequal pieces. Each piece is formed into a square frame. If the total area of the two frames are 117 square inches, what is the length of each piece of tubing?

Thanks for your help. Find the LCD:

x^3 over x^2+8x+16 times 3x-10 over x^2+x-12