What is the area enclosed by the graph of |x| + |3y = 10 shown here?
Four right triangles with height 10 / 3 base = 10 Can you calculate the area of a triangle? ..... then multiply by four.
Similarly, we have a rhombus with short diagonal 2(10/3) = 20/3 and long diagonal 2(10) = 20. From there it shouldn't be too hard to calculate the area.