A physicist need help

A physicist was studying the dependence a physical quantity $y$ on another quantity $x$ After performing a large number if experiments he discovered that the value of $y$ varies linearly with $x$ in other words we can say that $y$ is linear function of $x$ and in the language of mathametics we can express it as $\boxed{y = f(x)}$

where $f(x)$ is a linear function. In one of his experiments he needs to plot the graph of $f(x)$ , if it is known that $\boxed{f(0) = -5}$ and $\boxed{f(1) = -4}$ then what will be the angle in degrees that the graph of the function will make with positive direction of $x$ -axis