Two are true, one is not

Exercise and reference answers

Questions

1. False statement

   Equal slopes means perpendicular

   Statements

   1. Equal slopes means parallel
   2. Slopes multiplying to −1 means perpendicular
   3. Equal slopes means perpendicular

2. False statement

   Horizontal lines have undefined slope

   Statements

   1. Horizontal lines have undefined slope
   2. Horizontal lines have slope zero
   3. Vertical lines have undefined slope

3. False statement

   That holds at 90 degrees too

   Statements

   1. Slope equals tan of the angle with the x-axis
   2. That holds at 90 degrees too
   3. That fails at 90 degrees

Explanation