(8–9a)a=−40+(6–3a)(6+3a)
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The points (1,-2) and (4,16) are not in the line but the point (-3,-18) is on the line. (Work is shown in the image)
Answer: Yes this is a right triangle
We can determine this by using the converse of the pythagorean theorem.
a = 5, b = 12, c = 13
Since those a,b,c values work in the pythagorean theorem, this proves we have a right triangle.