The combined equation of the lines passing through the point $(3,4) \mathrm{and} \mathrm{each} \mathrm{making}$an angle ${45}^{\circ }\mathrm{with} \mathrm{the} \mathrm{line} \mathrm{x}+\mathrm{y}+1=0 \mathrm{is}$

slope of the line is $m$ and slope of the line $\mathrm{x}+\mathrm{y}+1=0$ is -1 then

angle between two lines is $45°$ then 

The combined equation of the lines passing through the point $(3,4)$ is $\left(x-3\right)\left(y-4\right)=0$