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January 21, 2017
Posted by **jean** on Wednesday, May 29, 2013 at 11:01pm.

x - 7y = 15

-3x + 21y = - 45

- algebra -
**Steve**, Thursday, May 30, 2013 at 11:03amThe 2nd equation is the 1st equation multiplied by -3. So, they are the same line, and there are infinitely many solutions.