Question

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

Answer 1

`y=mx`

Explanation:

`y=mx`

where, y is the total cost of the erasers,

m is the numbers of erasers,

x is the cost of each erasers.

Given:-
`m=19, y=3`

by putting these value in the above equation,

i.e.
`y=mx`

we get,

`3=19x`

`x=(3)/(19)`

`x=0.157`

Now for 45 erasers substitute the value of
`x=0.157`

so, we get
`y=45* 0.157`

`y=7.065`

cost of 45 erasers are $7.065