I am trying to envision the graphs of the following equations but for some reason or the other I am not able to figure a systematic way of graphing them. I need the most basic procedure to achieve their graphs. The equations are:
- $|y|=x$
- $y^2=x^2$
- $|x|+|y|=1$
- $|x+y|=1$
If am not mistaken, non of them are graphs of functions.