exam Maths Puzzle Numerical Ability

Solve the following system of linear inequalities by graphing: x - 2y <= 4 and x >= 1.

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exam Other Question

I have a question about an equation given as homework that I am having trouble with. It is 3x^-1/4 divided by 12x^-7. I first reduced the fraction by 3,leaving x^-1/4 in the nume I need to solve the equation y=3x & x=3y for both x & y. I can not come up with an answer that makes sense.