algebra 2 - bobpursley, Thursday, September 8, 2011 at 9:50pm
besides a calculator solution? Your calculator should be able to solve these.
add the first and third equations:
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:
now multipy the second equation by 7, then add the equations.