[tex]\huge{\boxed{\text{unde\\fined}}}[/tex]
The formula for slope is [tex]\frac{y_2-y_1}{x_2-x_1}[/tex], where [tex](x_1, y_1)[/tex] and [tex](x_2, y_2)[/tex] are the points.
Substitute in the values. [tex]\frac{-3-4}{1-1}[/tex]
Subtract. [tex]\frac{-7}{0}[/tex]
When you divide any number by zero, the quotient is [tex]\boxed{\text{unde\\fined}}[/tex].
A line with an undefined slope is a vertical (straight up and down) line.
