Two Variables · Superchallenge problem

The least-squares line predicting $y$ from $x$ is $\hat y = 4 + 2x$. Every $x$-value is replaced by $u = 5x + 1$ and every $y$-value by $v = 2 - 3y$. What is the intercept of the least-squares line predicting $v$ from $u$? Give a decimal.