Determine whether relationship is a function? me

If the x's repeat, then it is NOT a function.

For problem 2:
(3,5) and (6,5) actually don't cause a problem for us. Repeating y's in okay! So yes, this relation can be a function.

For problem 3:
(2,5) and (2,9) uh oh! We have x=2 being mapped to two different locations. Bad bad bad. This is NOT a function.

Ibelieve a is the correct answer because 3 is the y-intercept you can see it from the graph. so from here the answers could only be a and c. they are differently at the sign.substitute x with 1so the equation for a is 3*(1.4)^x3*(1.4)^1 = 4.2look back at the graph it is true that when x= 1 y= 4.2if you use equation from c. when x= 1 then y will be negative number which is falseso correct answer is a