posted by Anonymous .
I am not great at equations... I keep practicing and working these problems and questions out but I always seem to get different answers can someone please guide me on how or tell me the correct way to work these problems out>>
The linear equation
y=0.15x + 0.79
represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for example, as it is the first year in the study. Similarly, 2005 would be year 9, or x = 9.
a)What year would be represented by x = 4?
My answer is = year 2000
b)What x-value represents the year 2018?
c)What is the slope (or rate of change) of this equation?
How or where do I start on this one??
d)What is the y-intercept?
e)What does the y-intercept represent?
f)Assuming this growth trend continues, what will the price of gasoline be in the year 2018? How did you arrive at your answer?