b) x=22

c) the equation of a line is y=mx +b where m is the slope so 0.15 represents the slope.

d) b represents the y-intercept so what is the answer?

e) not sure what you are searching for here. When x=0 then y-.79 which is where it crosses the y-axis when x=0. So prior to 1997 the base amount of gasoline was 0.79.

f) when it is 2018 x-22 so y=0.15(22) +0.79. Gas will be $4.09 per gallon.

g)set up a graph with the horizontal axis representing the year and the vertical representing the total cost. Don’t forget that 1997 is actually x=1 so 1998 is x=2 etc. This is a linear equation (straight line). As the year increase so does the cost of gas. When x=1 the total cost is 0.94. Put a point on (1, 0.94) then go up 15 cents each year after.