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3x -y = 3
⇒ 3x = 3 -y
⇒ x = (3-y)/3 ..............(i)
9x - 3y = 9 ..........(ii)
Substituting (i) in (ii)
9/3(3-y) -3y = 9
⇒ 9 - 3y - 3y = 9
⇒ -6y = 9-9
⇒ y = 0
Now putting y = 0 in (i)
⇒x = (3-y)/3
⇒x = (3 - 0)/3
⇒x =3/3
⇒x = 1
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