exam Maths Puzzle Numerical Ability

how do I graph this?

x2 + y2 = 1

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exam Other Question

I can not find the correct answer to this one I got -5/1 for my answer. I need to find the slope of any line perpendicular to the line through points(0,5) (-3,-4)help me if you can. I have sent you several math questions and have not heard back from you, why?
Shirley