Equation of a perpendicular line

Question 1

The line $l_{1}$ has equation $y = -\frac{5}{2}x - 4$. The line $l_{2}$ is perpendicular to $l_{1}$ and passes through the point $(-6, -3)$. Find an equation of $l_{2}$ in the form $y = mx + c$, where m and c are constants.