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How do I solve:

  • math -

    no solutions, or empty set

    solve both equations for y:
    y >= -1.5x + 20
    y <= -1.5x + 42.5
    Same slope with different y-intercepts indicates parallel lines;
    Graph both, which shows the solution set: solutions for 1st equation are above the line, and solutions for 2nd equation are below the line, which means no point(s) of commonality.

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