exam Maths Puzzle Numerical Ability

I am not understanding on how to find the equation on letter a of number 1 pg 9. I understand how to find the equation with two points, but i dont see 2 points unless i dont know w

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exam Other Question

what happens when we try to prove that sqrt4 is irrational? Please help me solve this equation: the area of a frame is equal to the area of 4"x6" photo it surrounds. the frame is of uniform width. how wide is the frame?