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Least squares regression lines have the form of

$y = ax^2+bx+c$

Define $x$ and $y$ as variables.

Define $a$, $b$, and $c$ as constants.

$y = a+bx$

Define $a$ and $b$ as constants.

$y = ab^x$

$y = \cfrac{a}{x}$

Define $a$ as a constant.

$y = a+b \cdot \log(x)$