y - 5x = -6 and 3y - 15x = -12
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Infinitely many
none
y - 5x = -6 ----> y = 5x - 6
3y - 15x = -12
3y = 15x - 12 --> y = 5x - 4
I see two parallel lines, they have the same slope of 5,
but they have different y-intercepts
Your conclusion is .... ?