2x + 3y = 8
3y = 8 - 2x
y = 8/3 - 2/3x
6x + *y = L
*y = L - 6x
y = L/* - 6/* x
-6/* = - 2/3 in order to both lines be parallel
So * = 9
6x + 9y = L
L can have any of the three values I, II and III
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