In my opinion they are pointless and just another reason for people to hate math.
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By asking your teacher and listening to what she say and by taking note or after-school
Without an equality sign it is not an equation.
The equation x=c where c is a constant is the equation of a vertical line. It can't be a function but it is linear so the answer is no. For example, the vertical line produced by the linear equation x = 3 does not represent a function. We cannot write this equation so that y is a function of x because the only x-value is 3 and this "maps" to every real-number y.
There is one form of linear equation that is not a function, and that is when x = c, where c is a constant.
A linear function is a function, or equation, that when graphed, will form a straight line.
A straight line.