algebra

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Graph he inequality on a plane

4y - 5x> 20

I am confused, can you please help?

  • algebra -

    4y - 5x> 20
    ------------------
    first look at the equality
    4 y =5 x + 20
    or
    y = (5/4) x + 5
    straight line
    hits y axis at(0,5)
    hits x axis at (-4,0)
    above that line, for example at (0,6) you can see that 4y-5 is greater than 20 (24 in fact) so we want everything above that line

  • algebra -

    5x-4y=-18

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