Question 204312
Find the y-intercept of the straight line passing through points 
(-3,1) and (-1,-2)
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First you have to find the slope:
slope = (-2-1)/(-1--3) = -3/2
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Then you use the form y = mx + b to find b, which is the y-intercept.
You know y = 1 when x = -3 and you know m = -3/2
So solve for "b":
1 = (-3/2)-3 + b
1 = 9/2 + b
b = -7/2
The y-intercept is -7/2 or (0,-7/2).
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{{{graph(400,300,-10,10,-10,10,(-3/2)x-(7/2))}}}
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Cheers,
Stan H.