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algebra

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find the pair of parallel lines
1)-12y+15x=4
2)4y=-5x-4
3)15x=12y=-4

  • Algebra - clarifications required -

    1. slope = 15/12
    2. slope = -5/4
    3. slope = ? (two equal signs, so the sign of the slop could go either way.
    Please clarify.

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