Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. The y-axis
   2. The x-axis
   3. A flat line
   4. Slope of zero

   Odd item

   The y-axis

2. Items

   1. Inclination
   2. Slope
   3. Gradient
   4. Perimeter

   Odd item

   Perimeter

3. Items

   1. Equal slopes
   2. Parallel lines
   3. Same angle
   4. Minus one product

   Odd item

   Minus one product

4. Items

   1. Collinear points
   2. One straight line
   3. Same slope
   4. A closed circle

   Odd item

   A closed circle

Instructions

Tap the item that does not belong with the rest.

Explanation