Which of the followibg is a linear inequality in two variables?
A. xy = 2
B. x + y > 1
C. 2x > 2
D. 5x = y - 2
What type of relation is {1,a},{2,b},{3,c},{4,d},{5,e}?
A. one-to-one
B. many-to-one
C. one-to-many
D. may-to-many