In an ordered pair, what axis represents the input

Determine the relationship of ab and cd given the following points

A. 2.3y +2 +3.1y = 4.3y + 1.6 + 1.1y + 0.4 b. + 25 - = c. 5/8x + 2.5 = 3/8x + 1.5 + 1/4x d. 1/3 + 1/7y = 3/7y

21/2 divided by 3 1/3 = s divided by 4 1/4 . what is s?