Question

Given the set of ordered pair, find the domain and range, graph using mapping diagram and tell whether each set is a function or not
a) {(2,3), (2,4),(5,6),(7,8),(0,1)}
b) {(2,3),(3,2),(4,5),(5,4),(6,7),(7,6)}
c) {(4,3),(2,3),(1,3),(3,3),(5,3)}
d) {(1,2),(1,4),(1,3),(1,5),(1,6),(1,1)}?

Answer 1

for each set of (x,y) pairs,
domain is the set of all x values
range is the set of all y values
If no x value is used more than once, it is a function -- otherwise, not

Answer 2

I am not going to do all this for you but immediately
a) not a function, when x = 2 we have two values of y
b) looks ok but note goes up then down
c) horizontal line, range kind of limited
d) vertical line, domain is x= 1