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Math Help - can someone check behind me please

  1. #1
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    can someone check behind me please

    [2x-9]<3 ----- 2x-9+9<3+9 ----- 2x<12 -----x<6


    [3x-4]<-13----- 3x-4+4<-13+4 ---- 3x>-9 ---- x>-3



    [2x-2]=x+1 ----2x-2+2=x+1+2 ----2x=x+3-x ---2x-x=3 ----x=3


    solutions to systems

    y>-2x+1
    y<3x+5 (-3,2), (-1,5), (3,6) ---- I say it's (3,6)
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  2. #2
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    Quote Originally Posted by UKMUG
    [2x-9]<3 ----- 2x-9+9<3+9 ----- 2x<12 -----x<6


    [3x-4]<-13----- 3x-4+4<-13+4 ---- 3x>-9 ---- x>-3



    [2x-2]=x+1 ----2x-2+2=x+1+2 ----2x=x+3-x ---2x-x=3 ----x=3


    solutions to systems

    y>-2x+1
    y<3x+5 (-3,2), (-1,5), (3,6) ---- I say it's (3,6)
    You flipped the inequality in the second line. There's a spurious +x on the RHS in the third formula on the third line but the answer is OK.

    The system y > -2x+1 and y < 3x+5 has infinitely many solutions: if you draw a graph it's the collection of points between two parallel lines. Are you trying to solve all the equations and inequalities at once?
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