How do you find the distance from the origin to a point on the graph?

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-- square the point's x-coordinate
-- square the point's y-coordinate
-- add the two squares together
-- take the square-root of the sum
-- the answer is the distance of the point from the origin.
This works because if you draw a line down from the point to the x-axis (length is y-coordinate), then along the x-axis to the origin (length is x-coordinate), and back to the point (length is distance), you just made a right triangle.

Then you can use the Pythagorean Theorem to find the length of the long side (the distance) since you know the length of the two shorter sides.
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