The Homecoming Committee Is Blowing Up Balloons for the Big $y = 120 x + 40$

The homecoming committee is blowing up balloons for the big dance on Saturday. Forty balloons have already been inflated, and now the next shift comes in and is able to blow up 120 balloons per hour. Assuming they continue at this rate, write a linear equation that describes the total number of balloons blown up in terms of hours and use the equation to find out how many hours it will take them to reach their goal of having 760 balloons. A) $y = 120 x + 40$ ; 91 hours
B) $y = 40 x + 120 ; 31$ hours
C) $y = 40 x + 120 ; 55$ hours
D) $y = 120 x + 40 ; 6$ hours