Hi thth776, can you show us what have you tried already?
thth776, I checked the plot for both equations.
Study these two links:
abs(3x - 2y + 10) + abs(2x - 3y) = 10 - Wolfram|Alpha
x^3(1 - x) + y^3(1 - y) = 12xy + 18 - Wolfram|Alpha
I hope this steers you in the right direction.