Answer:

Step-by-step explanation:
Plugging these coordinates into this equation will give you this:
3 - 9 = −6 ☑
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The trick to solving this problem is to know and remember that the sum of all the interior angles of a triangle is always 180 degrees.
Thus, (6x+1) + (5x-17) + (9x-24) = 180.
20x = -40, so x = -2 (answer)