# Pre-Algebra

posted by mysterychicken

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

1. RickP

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

-3x - 2y = 0

-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)

2. mysterychicken

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

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