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Anonymous
Yes it is.
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It is a linear equation in one variable, x.
The solution is (x, y, z) = (2.5, 1, 2.5).
Yes, y = 3+x is linear.
It works out that x = 0 and y = 3
2x+3y = 6 2x+3(0) = 6 2x = 6 x = 6/2 x = 3