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y = 3x + 1 sub ke y² = ax
(3x+1)² = ax
9x^2 + 6x + 1 - ax = 0
9x^2 +(6-a) x + 1= 0
Agar memp. 1 penyelesaian D = 0
(6-a)² - 4(9)(1) = 0
(6-a)² = 36
6-a = √36
6-a = 6 atau 6-a = -6
a = 0 atau a = 12