Question 182441
An equation in slope-intercept form for the line passing through each pair of points:
(9, -1) and 6, -2) 
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slope = (-1--2)/(9-6) = 1/3
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Line form is y = mx + b; you know y=-1 when x = 9 and m=1/3; solve for "b":
-1 = (1/3)(-1) + b
-1 = (-1/3) + b
b = -2/3
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Equation:
y = (1/3)x - (2/3)
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Cheers,
Stan H.