If a car travels x miles/hour for 3 hours, how far car travel after 6 hours? a) x+3+3 miles
b) x+x miles
c) 9x miles
d) 2x miles
e) 6x+3x miles

e will be the answer for sure of miles it happene d for the past hours he traveled in and how long

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