The answer is A. X> -6 because the arrow shows which way the line is going
Y=2.5x+30 - the function where y = the total cost and x = the # of notebooks.
40 = 2.5x + 30 - Plug 40 into y and solve
10= 2.5x
x = 4, the number of notebooks she bought
First Youre going to want to bring all the y to one side so you’re gonna add +2y to each side, on the right it cancels out so itll be 5y-4=6, next your are going to add +4 to each side on the left it cancels out now you will have 5y=10, now you are gonna divide each side by 5, so youre answer will be y=2