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What could explain what happened when the time was equal to 120 minutes

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)