book Maths Puzzle Numerical Ability

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3x-7y<-21

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book Other Question

I need someone to explain these for me... it says to Find the GCF of the first two terms and the GCF of the last two terms for each polynomial.

10p^3-25p^2+4p-10

6n^3+3n^2+2n+1
Using the point slope formula, what is the equation of the line that passes through the points (1,5) and (0,0)? Please help me?