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Please verify that this Algebra work is correct please

  1. May 24, 2009 #1
    1. The problem statement, all variables and given/known data


    1.8x-3 (3x+6)=9 ; the solution is... x=3

    2.m+n/10 form m=88 and n=12 /...answer is m+n/10 = 20

    3. 2x+5y= 0 x=7-6y, my answer ..The soution is... (-5,2)

    4. the function H described by H(x) = 2.75x+ 71.48 can be used to predict the height,
    in centimeters, of a woman whose humerus(the bone from the elbow to the shoulder)
    is x cm long. Predict the height of a woman whose humeris is 40 cm long.
    my answer... The predicted height of a woman whose humerus is 40 cm long is..181.48cm

    2. Relevant equations



    3. The attempt at a solution
    Please confirm these are correct also..
    5.5(w-3)= -15 ...w=0

    6. 2x+3y=1 4x+6y=2 (I had to solve with the elimination method)
    my answer to what is the solution of the system is...No solution

    7. 8x-(3x+6)=9 ...my answer is x=3

    8. -0.4x<-24..my answer The solution is x..<60

    9.4>-3x+3 or 10<(or equal to)- 4x+5...answer ..negative infinity, -5/4

    10. 2x+9y=1 are (8,7) the solution...answer ...No

    11. 6[45-(54-49)] equals...answer 240

    12. 9/7*(8/3) = -24/7

    13. -5/8X= -9/10 The solution/answer is 36/25

    14. -2x>1/9 ..the solution answer is x/x< -1/18

    15.
    5x+2y=8
    5x+2y=2 ....answer these pair of lines are parallel and not perpendicular

    16.

    6+7x<20...answer x/x<2

    17. -19<(or equal to)3x-2<(or equal to)-1...answer x/ -17/3<(or equal to)x<
    (or equal to) 1/3
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 24, 2009 #2

    Cyosis

    User Avatar
    Homework Helper

    You can check these yourself. You found an answer now simply put the value for x in the original equation. If the equality holds you have the right answer, if it does not you have the wrong answer.
     
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