You do what I’d 9-3 , 8-0 , then combined it and you will get the right answer
Linear equations do have extraneous solutions
Area if the rectangle = 42 sq. inch
Area of a rectangle = l × b
42 = 12 × b
b = 42/12 = 3.5 inch
Now, perimeter of a rectangle= 2(l + b)
= 2(12+3.5) = 2(15.5) = 31 inches
