book Maths Puzzle Numerical Ability

i need help! how do u find out the constant of variation for an equation and determine the slope of a line?

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book Other Question

simplify- 3x(4+2y)-2x(3+8y)
This is my answer-
12x +6xy-6x+16xy Why is this wrong??? prove by mathematical induction that x-y is a factor of x^n- y^n