exam Maths Puzzle Numerical Ability

What ordered pairs is a solution for the equation 3x - 4y = 12?

Thank you very much!

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exam Other Question

I am stuck on correct answer for:

if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing.. find the LCD of
1 1
------- + ------
1 - x^2 x - 1