David lays bricks at a rate of 40 brick per hour. if he has a large job laying 2,400 bricks, how many hours will it take him to finish? If David works 8 hours per day , how many days will he work on this project?

Step-by-step explanation:

60 hours for entire job

divided by 8 hours per day 7 1/2 days

answer: i believe c. is the answer sorry if i am wrong

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