9: if 19 erasers cost $3, what is the equation that can determine the cost of 45 erasers

Step-by-step explanation:

where, y is the total cost of the erasers,

m is the numbers of erasers,

x is the cost of each erasers.

Given:-

by putting these value in the above equation,

i.e.

we get,

Now for 45 erasers substitute the value of

so, we get

cost of 45 erasers are $7.065

based on context clues you gave i'm assuming the answer would be c.