exam Maths Puzzle Numerical Ability

Solve the system by substitution:
4x - 12y = 5
-x + 3y = -1

Thanks for any help you can give me.

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exam Other Question

I am having difficulty with this equation.
Find the inverse of the function,

f(x) = (3 + 2x)/(2-5x)
directions: find the roots of each quadratic equation by factoring. my equation is x^2-6x+8. whats the answer?