Respuesta :

vijetaramasamy

Isolate the variable y

Line a: 3y = x+6

            y =  1/3x + 2

Line b: 3y = x+18

            y = 1/3 x + 6

Line c: 3y = 2x+9

            y = 2/3x +3

Explanation:

Lines a and b are parallel because they have the same slope of 1/3.