exam Maths Puzzle Numerical Ability

Rewrite each equation as a function of x.
Problem: -3x + 4y = 11

4y = 3x + 11
y = -3/4x + 11
f(x) = -3/4x + 11

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How many pounds of a 12% aluminum alloy must be mixed with 400 pounds of a 25% aluminum alloy to make a 17% aluminum alloy? Multiply and Simplify: x^2-7x+12/x^2-6x+8 * x^2+6x+8/x^2-x-6