Question 93599
Write an equation of the line through (1,-3) and (-2,6). 
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slope = [6--3] / [-2-1] = 9/-3 = -3
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Form of the line is y = mx+b 
You have m= -3 and y=6 when x=-2 so you can solve for "b":
6 = -3*-2+b
b = 0
EQUATION:
y = -3x
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Cheers,
Stan H.