What is the value of x? how can you find the value of y if you know the value of x?

ummm it depends on the question for example if they give u a number for a certain variable if u could solve it like y-x=4  what is the value of x if y= 5 ?

5-x=4 so 5-4=1  ans: x= 1

or what is the value of y in terms of x    

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

just needed some points but try socratic