exam Maths Puzzle Numerical Ability

solve this system by substitution
8x-4y=16 y=2x-4

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exam Other Question

I am working on a Proof by Induction and keep getting bogged down in the exponents in the inductive step. Please help me simplify:

5/2[2/3(2^n - 2^(-n))] - 2/3(2^(n-1)- 2^(n-1)) What is the slope of the line passing through the points (9,2) and (0,0)?