exam Maths Puzzle Numerical Ability

what is the easiest way to solve a linear equation using the subtitution method?

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exam Other Question

Solve the system by graphing. 2x + 4y = 2 x + 2y = 1 let f(x)=x^3-8x^2+17x-9. Use the factor theorem to find another solution to f(x)-f(1)=0, besides x=1