exam Maths Puzzle Numerical Ability

Factor completely: x^2 - 8x + 16.

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exam Other Question

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 how do you find the y-intercept to an equation like this y=3/5x-4