What is the obtuse angle between the lines whose slopes are $2-\sqrt{3}$ and $2+\sqrt{3}?$

Consider the following statements
1. For an equation of a line, $x\cos \theta +y\sin \theta =p,$ in normal form, the length of the perpendicular from the point $(\alpha ,\beta )$ to the line is $|\alpha \cos \theta +\beta \sin \theta +p|$

The length of the perpendicular from the point $(\alpha ,\beta )$ to the line $\frac{x}{a}+\frac{y}{b}=1$ is $\left|\frac{a\alpha +b\beta -ab}{\sqrt{a^2+b^2}}\right|$
Which of the above statements is/are correct?

If the lines $3y+4x=1, y=x+5$ and $5y+bx=3$ are concurrent, then what is the value of $b ?$