book Maths Puzzle Numerical Ability

Find the slope of the line determined by the equation:

Y = X - 12
______
4

Please enter your answer as a fraction.

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book Other Question

Write the equation of the ellipse:

sum of focal radii is 20 and the y intercepts are 7 and -7. The center is (0,0). If x/y=4/7 and y/z=14/3.What is the value of [x+y]/z? could you solve this?