book Maths Puzzle Numerical Ability

(4xsquared - y to the 4th)

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book Other Question

I am having trouble with this question, Find the Lowest Common Denominator of

3 7
---- and ------
x^3 xy^4

I think the answer is

xy^4

Am I right, Can someone let me know?
Solve the following nonlinear system for x and y. Sketch a graph, showing the intersection points.

x + y = 7
x^2 + y^2 = 25