You and your friend are splitting a restaurant bill and leaving a tip. you pay half of the bill plus $5. your friend paid half of the bill plus 25% of the bill. you and your friend paid the same total amount. how much is half the bill? write an equation.

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

x coordinate is none

step-by-step explanation: