Question

Ab=3x+y cm bc=3x+2 cm CD=3y-2x cm da =y+3cm

Answer 1

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AB = 3x + y

BC = 3x + 2

CD = 3y - 2x

DC = y + 3

Add all these equations :

(AB + BC + CD + DC) = 3x + y + 3x + 2+ 3y - 2x + y + 3

AB+ BC + CD + DA = 4x + 5y + 5