Which of the following sets of numbers could be the side lengths of a right triangle? 3, 4, and 7
9, 40, and 42
8, 15, and 16
20, 21, and 29

For a right triangle, the two shorter sides (the legs a and b) squared must add up to equal the longest side (the hypotenuse or c) squared. This is the pythagorean theorem:

a squared + b squared = c squared

If you try all the sets in the pythagorean theorem equation, 20, 21 and 29 are the only ones that work out, so that would be the answer.

You would need a laid out graph for this but could you provide a picture of just a graph? i can give stepssolve for y.subtract 4xdivide by -1 (opposites)graph slope intercept formcheck each point to see if it’s on the graph