Respuesta :

notriannelol

Step-by-step explanation:

A) opposite sides in a rectangle is always equal

B) 9x+12 = 4x +47

Transpose = 9x - 4x = 47 - 12

solve = 5x = 35

Divide both sides by 5

x = 7
One of the property of rectangle is opposite sides are equal
Therefore 9x+12=4x+47

9x+12=4x+47
5x=35
Therefore x=7