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A scatterplot's line of best fit has equation $y = 2x + 5$. At $x = 10$, what is the predicted value of $y$?
A$25$
B$20$
C$15$
D$50$
Answer & Solution
Correct answer: A. $25$
Substitute $x = 10$: $y = 2(10) + 5 = 25$. Reading the predicted value at a chosen $x$ is the line-of-best-fit's main use.
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