Question

What is the slope of the line that passes through (1, 4) and (1, -3)?

Answer 1

`\huge{\boxed{\text{unde\\fined}}}`

The formula for slope is
`(y_2-y_1)/(x_2-x_1)`, where
`(x_1, y_1)` and
`(x_2, y_2)` are the points.

Substitute in the values.
`(-3-4)/(1-1)`

Subtract.
`(-7)/(0)`

When you divide any number by zero, the quotient is
`\boxed{\text{unde\\fined}}`.

A line with an undefined slope is a vertical (straight up and down) line.