The price of white socks can be expressed in terms of red socks. the highest price at which white socks can be traded that would make both cities better off is of red socks per pair of white socks, and the lowest price that makes both cities better off is of red socks per pair of white socks.

3.76%

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