



 
Hi Tiffany, What I see first is z in the first equation and z in the second equation so if I add the equations the z terms will cancel. Thus add equation 1 to equation 2 to get
To obtain another equation with z eliminated multiply the first equation by 2 and add the result to the third equation. This gives
Can you now solve these two equations for y? Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 