I'm trying to buy this style fence. i have 480 feet to cover and each rail is 16 feet long. how many do i need? once they arrive i will cut them into 8 feet rails, how many posts would i need?

4x and 6y

im not sure though

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

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation: