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Let's calculate the slope using the points (-6,3) and (-3,1):
m = (1-3)/(-3+6)
m = -2/3
Now that we have the slope, let's find the y-intercept using the point (-3,1):
1 = (-2/3)(-3) + b
1 = 2 + b
b = -1
Therefore, the equation of the line is:
y = -2/3x - 1
So, the correct answer is:
D. y = -2/3x - 1