Cassie has a wood board that is 34 foot long. She wants to cut the board into pieces that are 18 foot long. Which expression will help Cassie find how many pieces she can cut?

x =

Step-by-step explanation:

Let the number of pieces she can cut be x.

x =

equal to

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