Write All Linear Equations in Slope-Intercept Form $y = - \frac { 3 } { 2 } x + \frac { 59 } { 2 }$

Write all linear equations in slope-intercept form.
-A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 45 mph results in a rating of 38 mpg, whereas at an
Average speed of 55 mph, her car rates 23 mpg. Find a linear equation to model the gas mileage y
For an average speed of x mph. Find the slope-intercept form of the equation of the line.

A) $y = - \frac { 3 } { 2 } x + \frac { 59 } { 2 }$
B) $y = \frac { 2 } { 3 } x + \frac { 59 } { 2 }$
C) $y = - \frac { 3 } { 2 } x + \frac { 211 } { 2 }$
D) $y = \frac { 2 } { 3 } x + \frac { 211 } { 2 }$