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#1 2007-02-02 03:49:27

jxharmon
Member
Registered: 2007-01-08
Posts: 104

stumped on addition again please help

solve systems by addition
x+5y=10 and -2x -10y=-20 so if multiply the first equation by 2 I get 2x+10y=20 to me that would cancel out the other equation I'm so lost????

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#2 2007-02-02 03:56:21

pi man
Member
Registered: 2006-07-06
Posts: 251

Re: stumped on addition again please help

The 2 equations are essentially the same.   One of them is just the other multiplied by -2.   So you won't be able to solve for X and Y.   For that, you would need 2 different equations.   So either it's a trick question or there is a typo.

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#3 2007-02-02 04:13:46

jxharmon
Member
Registered: 2007-01-08
Posts: 104

Re: stumped on addition again please help

thanks I just thought I had lost it!!

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