exam Maths Puzzle Numerical Ability

I couldnt figure this one out (factoring)

y^4-14y^3+49y^2

THANKS

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exam Other Question

A which of the following points is on the line y = 3x - 7? (3,3) (3,2) (3,1) (3,0) Describe where each of the other three points is in relationship to this line.

B find anoth This is a last Subsitution question, but this one says solve by either ;addition or subtraction.

The problem is:
12a-5b=18
15a-5b=30

Please and Thank You=)