Question 824256
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AB:
dx = x2 - x1
dx = 1 - 4 = -3
dy = y2 - y1
dy = -1 - 5 = -6
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BC:
x2 = dx + x1
x2 = -3 + 1 = -2
y2 = dy + y1
y2 = -6 + -1 = -7
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C = (-2, -7)
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