Ask Me Help Desk

Ask Me Help Desk (https://www.askmehelpdesk.com/forum.php)
-   Math & Sciences (https://www.askmehelpdesk.com/forumdisplay.php?f=402)
-   -   3x 4y = -2 and 2x - 3y = 10 (https://www.askmehelpdesk.com/showthread.php?t=656737)

  • May 2, 2012, 07:25 PM
    FusionOfCulture
    3x 4y = -2 and 2x - 3y = 10
    3x 4y = -2 and 2x - 3y = 10
    I really don't know what to do , this is my first time seeing this problem and its very hard to me because I don't know what to do , Help Please ?
  • May 2, 2012, 11:00 PM
    naresh821
    I think that there must be some sign between 3x 4y.. it seems to be a wrong/ misprint question.
  • May 3, 2012, 08:56 AM
    Sunwillshine
    Hmm there must be a sign between 3x 4y and you have to solve first in respect of y and then in respect with x
    Lets say the sign that is missing is + so the equation will be 3x+4y=-2
    So we start to find y:
    3x+4y=-2
    2x-3y=10


    You can put this solution on YOUR website!
    3x=-2y+4
    3x/3=-2y/3+4/3
    x=-2y/3+4/3
    Now if I substitute this into the 2nd equation 2x-3y=6, I have:
    2(-2y/3+4/3)-3y=6
    -4y/3+8/3-3Y=6
    -4Y/3-3Y=6-8/3 combine the y terms by finding a common denominator (3).
    (-4Y-3Y*3)/3=(6*3-8)/3
    (-4Y-9Y)/3=(18-8)/3 cancel out the 3 in the denominators.
    -13y=10
    y=-10/13 ans.
    Replace y by (-10/13) in the first equation.
    3x=-2(-10/13)+4
    3x=20/13+4 divide both sides by 3.
    x=20/13*1/3+4/3
    x=20/39+4/3 find the common denominator (39).
    x=(20+4*13)/39
    x=(20+52)/39
    x=72/39 reduce the fraction.
    x=24/13 ans.


  • All times are GMT -7. The time now is 09:30 PM.