The slope of the regression line has the same sign as the correlation coefficient $r$. Since $r = 0.35$ is a positive number, the slope of the regression line is positive.

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Here are some related questions:

1. What is the formula for calculating the slope of a regression line?
2. How do we interpret the value of the correlation coefficient?
3. Can a correlation coefficient of 0 imply a non-linear relationship?
4. What is the significance of a positive or negative correlation?
5. How is the coefficient of determination $r^2$ related to $r$?

Tip: The closer the correlation coefficient $r$ is to 1 or -1, the stronger the linear relationship between $x$ and $y$.