SOLUTION: what is the slope of this line through each pair of points (1,-19),(-2,-7)

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Question 947129: what is the slope of this line through each pair of points (1,-19),(-2,-7)
Answer by MathLover1(20849) About Me  (Show Source):
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Solved by pluggable solver: Find the equation of line going through points
hahaWe are trying to find equation of form y=ax+b, where a is slope, and b is intercept, which passes through points (x1, y1) = (1, -19) and (x2, y2) = (-2, -7).
Slope a is a+=+%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29+=+%28-7--19%29%2F%28-2-1%29+=+-4.
Intercept is found from equation a%2Ax%5B1%5D%2Bb+=+y%5B1%5D, or -4%2A1+%2Bb+=+-15. From that,
intercept b is b=y%5B1%5D-a%2Ax%5B1%5D, or b=-19--4%2A1+=+-15.

y=(-4)x + (-15)

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