The volume of a rectangular dog kennel is modeled by the polynomial 23 + 13x2 + 55x + 75. If the height of the kennel is modeled by (x + 3) and the
length and the width are identical to each other, what expression represents the length of the
dog kennel?

answer: -8.2562234e+13

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