Determine whether each relationship is a function. explain. (2,9), (3,12), (4,12), (2,8), (1,6)

  Not a function

Step-by-step explanation:

The relation gives more than one "y" value for the "x" value of 2, so the relation is not a function. A function maps each domain value to exactly one range value.

cost per km =  $ 2.25

Step-by-step explanation:

The cost per kilometer is the cost accrued for 1 kilometer. The cost for 1 kilometer can be calculated from the total amount charged for the entire distance covered . Since Emmanuel was charged $32 for 14 2/9 km he will be charged how much for 1 km .  

$32 was paid for 128/9 km

? was paid for  1 km

cross multiply

cost per km = 32/128 × 9

cost per km = 288/128

cost per km =  $ 2.25