a post office always charges a flat one time fee for any order. one time, michael sent 35 letters and paid 26 dollars. the next time, he sent 18 letters and paid $14.10. how much does the post office charge to send one letter? what is the flat fee?

$0.70 per letter, $1.50 flat fee

Step-by-step explanation:

x+18y=14.1 -> x=-18y+14.1

x+35y=26

|

\/

(-18y+14.1)+35y=26 -> 17y=11.9 -> y=0.7

|

\/

x+35(0.7)=26 -> x+24.5=26 -> x=1.5

|

\/

y=0.7

x=1.5

Hope this helps. :)

$0.70 per letter, $1.50 flat fee

Step-by-step explanation:

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.