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January 30, 2015

January 30, 2015

Posted by **Linda** on Monday, November 14, 2011 at 4:32pm.

3x – 15y = -12

3x + 24y = -12

- algebra -
**Reiny**, Monday, November 14, 2011 at 6:46pmRather than substitution, why don't we just subtract them as they stand.

-29y = 0

y = 0

then 3x = -12

x = -4

If you really have to use substitution,

form the first , 3x = 15y - 12

into the 2nd

15y - 12 + 24y = -12

29y = 0

then 3x = 15(0) - 12

3x = -12

x = -4

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