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December 18, 2014

December 18, 2014

Posted by **Sue** on Monday, November 26, 2012 at 1:46pm.

please explain the steps

- algebra -
**Steve**, Monday, November 26, 2012 at 2:35pm5x + 3y = 47

10x - 4y = 54

substitution:

5x = 47 - 3y, so 10x = 94-6y, thus

10x-4y = 94-6y - 4y = 54

-10y = -40

y=4

so, x = 7

elimination:

multiply the first equation by 4 and the 2nd by 3

20x+12y = 188

30x-12y = 162

add them, and the y's go away:

50x = 350

x=7

so, y=4

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