# Quick math help

a set of data points has a correlation r= -0.86 your friend claims that because the correlation is close to -1 it is reasonable to use the line of best fit to make predictions is your friend correct explain your reasoning.

I say she isn't correct because she needs x and y to see if it's linear. Correct me if I'm wrong!

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1. No, you are correct. Great job!

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2. I disagree. A coefficient near 1 indicates that the data points lie very close to the best-fit line. So, using the line should provide useful approximations.

The fact that we're even talking about a line of best fit indicates that the data are linear, or close to it. Otherwise, the coefficient would be near zero.

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