One way is if the denominator becomes zero.
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The equation is undefined when the 0 is on the bottom of a fraction. This is because division by zero is not defined in mathematics and leads to undefined values. If the 0 is on the top of the fraction, the equation can still be evaluated and the value would be 0.
Any vertical line has an undefined slope. The equation of the vertical line is x = a where the x-intercept is a.
Division by zero is undefined.
Division by zero is undefined.
Division, of any number, by 0 is not defined.