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Posted by on Wednesday, May 6, 2009 at 10:30am.

Can someone please help me answer these two questions? I have already answered one, and need it checked.

Give any three ordered pairs that are solutions of the equation:

1. x-y=6
(12,6)
(10,4)
(15,9)

2.-3x - 2y = 0

???

3.2x- 3y = 12
I have only one ordered pair for this:
(9,2)
2 more needed

Thanks!
-MC

  • Pre-Algebra - , Wednesday, May 6, 2009 at 10:45am

    It would be easier if you solve the equations for y, then plug in a value for x.

    -3x - 2y = 0

    add 3x to both sides
    -2y = 3x

    divide both sides by -2
    y = (-3/2) x

    Now just pick numbers for x (because of the 2 in the denominator, it will help to pick even integers).

    x = 2
    y = (-3/2) 2
    y = -3
    so (2, -3)

    x = 0
    y = (-3/2) 0
    y = 0
    so (0, 0)

    x = -2
    y = (-3/2)(-2)
    y = 3
    so (-2, 3)

  • Pre-Algebra - , Wednesday, May 6, 2009 at 11:21am

    Thank you Rick!!
    I need two more for the third one though...
    -MC

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