Why is it often preferable to use more than one predictor variable in a regression analysis?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.6: Regression And Median-fit Lines
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Why is it often preferable to use more than one predictor variable in a regression analysis?

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