A rectangular fish tank has a base that is 9 inches by 8 inches. How much water will it take to fill the
tank to a depth of 10 inches?

V=LWH

L=8

W=7

H=5

V=8*7*5=280 in^3

you need 280 in^3 of water

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