Can anyone tell me easiest way to solve questions like

1) Area b/w graphs->f(x)=||x|-2|+||x|-4|;g(x)=|x|+||x|-6|

2)No of values satisfying the inequation-->|x|+|x-1|+|x+3|<6

3)Equations in more than one variable like--> no of values satisfying the equation |x+1|+|y+1|<4

Explain the method as well

Cheerz!!!