45 divided by 3= 15 then 15 times 4 =60 mph
EXPLANATION:
-To formulate an equation, you must first know what data the exercise gives us to locate them correctly.
data:
-6 that must be added to a number.
-four times a number that is equal to 4x
-a result that is equal to 50
Now with these data we formulate the equation:

if we solve the equation we have:
So, you go to the y axis and find 40 meters on the graph. Then, you go across to find out that x (time in seconds) is 20 seconds. So, in 20 seconds Tom walks 40 meters.