SOLUTION: The points on a graph are (-1,-1) and (9,1). What is the equation of the line?

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Question 921562: The points on a graph are (-1,-1) and (9,1). What is the equation of the line?
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

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, -1) and (x2, y2) = (9, 1).
Slope a is a+=+%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29+=+%281--1%29%2F%289--1%29+=+0.2.
Intercept is found from equation a%2Ax%5B1%5D%2Bb+=+y%5B1%5D, or 0.2%2A-1+%2Bb+=+-0.8. From that,
intercept b is b=y%5B1%5D-a%2Ax%5B1%5D, or b=-1-0.2%2A-1+=+-0.8.

y=(0.2)x + (-0.8)

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