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Question 372597: why x=4 is not a function of a linear equation?
Answer by Jk22(389)   (Show Source):
You can put this solution on YOUR website! Normally linear function are straight lines passing at the origin (0,0)
linear function in 2d are of the form y=ax, more generally : ax+by=0 is the equation of a linear function.
x=4 is the equation of a vertical line passing at x=4.
We have that the sum of 2 linear function should be linear again, let suppose
ax+by = 0 one of those, then adding with x=4 gives :
(a+1)x+by = 4.
this 4 makes that x=4 is not the equation of a linear function.
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