x + y=80 can you solve for x, y or z? Hi, The one word answer is no. The reason is that the two equations don't completely determine x, y and z. - If x = 1 then y = 79 and z = 99
- If x = 2 then y = 78 and z = 98
- If x = 3 then y = 77 and z = 97
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