A)The y-intercept is 50 because when X=0, y=50. This shows that the car was moving at 50 mph as an initial speed.
B) in two hours (from 1 to 3) the speed increased by 4 miles per 2hours. (from 52 to 56). 4/2 = 2 mph, which is the average rate of change. This represents the amount of speed increased each hour.
C) y=2x+50, and y=60 in this case, so 60=2x+50
60=2x+50
-50 -50
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10=2x
5=x, so the domain is X<=5 (less than or equal to 5)
They y-axis represents the -3 now all that you need to do is line it up to -3 and 3 in the graph
2/9 as a decimal is 0.2222...
To simplify the ratio. You have to find both of these numbers Greatest common factor. Which happens to be 3 :P
So divide each number by 3
15 ÷ 3 = 5
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3 ÷ 3 = 1
So this means our new simplified ratio is...
5 seconds to 1 minute.
Good Luck! :)
