book Maths Puzzle Numerical Ability

what is the sum of 5/8y and 1/y(y+2)?
what is the difference of 5y/x^27y and 4/2y-14?
what is the difference of 5x/x^2-x-6 and 4/x^2+4x+4?

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book Other Question

solve the following system of linear equations:

3x-2y+4z=1

x+y+2Z=3

2x-3y+6z=8 Plot points with coordinates (2, 3), (3, 4), and (4, 5) on a graph. What do you observe? Can you give the coordinates of another point with the same property?

I do not know how to create a graph in Excel to plot this...can someone help me?