exam Maths Puzzle Numerical Ability

Which is the slope of Ax+By=C?

-B/A C/A -A/B C/B

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exam Other Question

4/(x-1)-2/(x+2)=4x-4-2x-4=2x-8=x=4 Simplify: (27^(-2x))(25^x)^4(3^(6x))^1/2 / 9^x(625^(x-1)^-2