exam Maths Puzzle Numerical Ability

Can someone show me how to write the rational expression in lowest terms?

r-13/13-r

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exam Other Question

If I am given three points and ask to find a fourth so that they are vertices of a parallelogram, how do I find the fourth? Determine which two equations represent parallel lines.
(a) y = 5/8x + 3
(b) y = -8/5x - 8
(c) y = 3x + 11 (d) y = 3x - 3