11

a speed walker covered 6 3/4 mi in 1 1/2 hour. how far will he walk with the same pace in 2.5 hours

11.25 miles

Step-by-step explanation:

If you divide 6.75 by 1.5 then you would get that he walks 4.5 miles an hour. Then you would multiply 4.5 by 2.5 to get that he walks 11.25 miles in 2.5 hours.

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