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December 21, 2014

December 21, 2014

Posted by **Caroline** on Tuesday, January 22, 2013 at 9:09pm.

4x-y=9 and 2x+3y=12

I worked this problem myself and could not find a possible solution. So I put that it is inconsistent. Is that correct? If not could you please help me?

- Pre-Calculus -
**Reiny**, Tuesday, January 22, 2013 at 9:56pmfrom the 1st ---> 4x-9 = y

sub that into the 2nd

2x + 3(4x-9) = 12

2x + 12x - 27 = 12

14x = 39

x = 39/14

y = 4(39/14) - 9 = 15/7

check:

1st:

LS = 4(39/14) - 15/7

= 156/14 - 30/14

= 126/14 = 9 = RS

2nd:

LS = 2(39/14) + 3(15/7)

= 39/7+ 45/7

= 84/7 = 12 = RS

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