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January 28, 2015

January 28, 2015

Posted by **suzy** on Thursday, September 8, 2011 at 9:19pm.

x-y+4z=10

2x+3y-z=53

- algebra 2 -
**bobpursley**, Thursday, September 8, 2011 at 9:50pmbesides a calculator solution? Your calculator should be able to solve these.

Manually:

add the first and third equations:

5x+y=62

multipy the first equation by 4

12x-8y+4z=36 and subtract equation 2 from that, or

11x-7y=26, and combine that with the original combination:

11x-7y=26

6x+y=62

now multipy the second equation by 7, then add the equations.

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