exam Maths Puzzle Numerical Ability

How do I learn to identify if certain figures are polygons or not??

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exam Other Question

Write an equation of a line through the given points.

(4,3) (-2,1)

In know the answer being, y=1/3x+1 2/3... It says the answer in the back of the book. Now could someone explain how to come upon this answer?? what is the difference in commutative property and associatative property?