6x=7-4y
Move 'y' to one side
6x-7=-4y
6x-7
------- = y
-4
21/25 is already a fraction and if you wanted it to be simplified, its already simplified to be 21/25.
First you gave to get the denominators all the same then you can answer the questions
THE ANSWER IS 1.25 X 10^3
(1,0) and (7,0) are the x intercepts