Sarah bought a binder for 7.25 and six folders totaled for 9.05. how much did each folder cost

binder + folders = total cost

7.25 + folders = 9.05

he bought 6 folders at x cost each

7.25 + 6x =9.05

subtract 7.25 from each side

6x = 9.05-7.25

6x= 1.80

divide each side by 6

x = .30

Each folder cost $.30 or 30 cents

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18