The equation is the definition of the line.
If the line is undefined, then it has no equation.
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it means that the line in the linear equation is a vertical line
No. Vertical lines and horizontal lines have undefined and 0 slopes. Undefined could be any number, so the answer is No. Good luck with your Apex :)
No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.
No. The equation x=7 has an undefined slope since it is simply a vertical line located at x = 7. A basic test for a function is if you can draw a vertical line through the graph of the equation and it touches in more than one place, it is NOT a function.
Undefined.