-21
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Points: (6, -10) and (-15, 15) Slope: (-10-15)/(6--15) = -25/21
-6 -15 = -21
nine
5X + 6 = 2X + 15 -2X -2X 3X + 6 = 15 -6 -6 3X = 15 ---- ----- 3 3 x = 5 im so smart.
9 - (-6) = 9 + 6 = 15 is the difference between -6 and 9. It could also be -15 if the equation is written as -6 - 9 = -15.