A wire with a length of 54 cm is bent to form a shape as shown in the diagram. what is the length of side AB

Step-by-step explanation:

Length of the wire = 54 cm

12 + (AB + 9) + 9 + 12 + AB = 54

Add the like terms

12+ 9 + 9 + 12  + AB + AB = 54

42 + 2AB = 54

      2AB = 54 - 42

      2AB = 12

        AB = 12/2

AB = 6 cm

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