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| Math Central | Quandaries & Queries |
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Question from Tiffany, a student: solve: x + y + z = 4 thanks! |
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
3x - 2y = 5
To obtain another equation with z eliminated multiply the first equation by 2 and add the result to the third equation. This gives
6x + 3y = 24
Can you now solve these two equations for y?
Penny
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