If sets A and B are defined as
A = {(x,y):y = ex,x∈R}
B = {(x,y):y = x,x∈R}, then
B ⊂ A
A ⊂ B
A∩B = ϕ
A∪B−A
Draw graphs in the same coordinate plane and observe no.of common points. As we can see from the graph, there are 0 intersection points. Hence, A∩B=ϕ