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Find the equation of the line that contains the ordered pairs given on the table

Algebra
Tutor: None Selected Time limit: 0 Hours

X Y         Inter the answer as y=mx+c

-2.4

-1. 2

-4. 8.  

Dec 9th, 2014

Pick any two points to find the slope using the change in y (Y2 - Y1) divided by the change in x  (X2 - X1). For example, if we use points (-2, 4) and (-1,2), we have (4-2)/([-2]-[-1])=2/(-1)=-1 so m=-2.  Use point slope form and one of the points to get the equation:
y-(2)=-2(x-[-1]) which becomes y= -2x when we solve for y. Here, you want to check if the 3rd point is on the line, otherwise it's not possible to make a line. plug in x=-4, and we get y=-2(-4)=8, which is perfect.

Dec 9th, 2014

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Dec 9th, 2014
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Dec 9th, 2014
Dec 9th, 2016
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