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I don’t understand 9) PLEASE HELP!!! The line y=2.5x-7

I don’t understand 9) PLEASE HELP!!! The line y=2.5x-7-example-1
User Hedfol
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The residual of a line is the observed Y value (the numbers in the table) minus the actual value (the Y value you get when you plug in the X value into the equation)... This question is asking you to find the residuals of all the points, square them, and add them...

For example, the observed Y value for -4 is -15. When you plug in -4 into the equation, you get this:

2.5x-7
2.5(-4) -7
-10 -7
=-17

The observed Y val. is -15, while the actual (equation) one is -17. -15 -(-17) is 2. 2^2 = 4

Do this process for all of the points, the add up the squared residuals, and you'll be done!

Hope this helped!

User Sherpa
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