The y-intercept is 2.5; it represents the change in $y$ for each unit increase in $x$

The y-intercept is 8; it represents the predicted value of $y$ when $x = 0$

The y-intercept is 8; it represents the change in $y$ for each unit increase in $x$

The y-intercept is 2.5; it represents the predicted value of $y$ when $x = 0$