exam Maths Puzzle Numerical Ability

find the equation that represents a line l that goes through (–2, –9) and has a slope of 5

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exam Other Question

do not understand how to do this factor completely:

9m^2-9

choices:
1) (3m-3)+(3m+3)
2) (3m+3)^2
3) (3m+3)(3m-3)
4) (3m-3)^6

??what is the difference between option 1 and option 3?