12 is div. by 3 but not 9
Xy = 72
x - y = 1
x = 1 + y
(1+y)y = 72
y + y^2 = 72
y^2 + y - 72 = 0
(y-8)(y+9) = 0
y = 8 , y = - 9
x = 1 + 8
x = 9
y = 8
i am a mathematics teacher. if anything to ask please pm me
Answer:
w is the length
Step-by-step explanation:
length squared is always the area of a square
