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Q: Is a vertical line a linear function?
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Is there instance in which a linear equation is not a function?

yes, a vertical line is linear, but it's not a function.


A graph of a non-vertical straight line is a?

Linear function


Is there an instance when a linear equation is not a function?

Yes, a vertical line is linear, but it is not a function, because every point on the line has the same x value.


What do you call a function whose graph is a non-vertical line?

It is a function. If the graph contains at least two points on the same vertical line, then it is not a function. This is called the vertical line test.


What is a function whose graph is a nonvertical line or part of a non-vertical line?

A linear equation


When is it not a function?

A function is not a function if it passes through the vertical line test more than once, and it is not linear or a quadratic.


How are linear equations and functions alike?

They are not. A vertical line is not a function so all linear equations are not functions. And all functions are not linear equations.


Can a linear function does not have a y-intercept?

X = 3 A vertical line not having a Y intercept.


When a linear equation can not be a function?

The linear equation x=5 or any other number is a vertical line. There are more than one possible answer for y. Therefore it is not a function.


Is 2y equals 8 a linear function?

Yes, 2y = 8 is a linear function. 2y = 8 is the same as y=8/2, or y=4, which is a vertical line.


(-1,0),(-1),(-3,1),(-3,1) it is a function or not?

A function is not a function if it passes through the vertical line test more than once, and it is not linear or a quadratic.


Are all linear equations functions why or why not?

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.