How do you turn frations into mixed frations

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which graph represents the linear function below? y-4= (4/3)(x-2)