Answer
Intercept = 6.785
This value is not statistically meaningful because it doesn't make sense that a car that gets 0 mpg in the city gets 6.785 highway mpg.
Work Step by Step
To identify the slope of the regression line, use the following equation: y = a + b(x), where y is the predicted y value for a given value of x; a is the intercept; and b is the slope.
Reworking the given regression line to fit this structure we have y = 6.785 + 1.033 (x). This means that the intercept (a) is equal to 6.785