plotting - How to plot the 2-D graph of $|x|+|x+y|=1$? - Mathematica Stack Exchange
Calculate the contour integral C of the function xy^2 dx + x^3 dy, where C is the curve abs(x) + abs(y) = 1 oriented counterclockwise. | Homework.Study.com
Absolute value graph and function review (article) | Khan Academy
How do you graph y = 1 + |x-1|? | Socratic
maple - How do I plot an inequality containing absolute values? - Mathematics Stack Exchange
absolute function
Graph Cobination of Absolute Functions x+abs x equals y+abs y - YouTube
graphics3d - Find the volume of the region defined by $|x|+|y|+|z|<4$ - Mathematica Stack Exchange