The points $(1,4)$, $(-3,4)$ and $(7,4)$ all lie on a:

The points $(1,4)$, $(-3,4)$ and $(7,4)$ all lie on a:
  1. Vertical line
  2. Horizontal line through $y=4$
  3. Line of slope $1$
  4. Parabola

Solution

All three points share $y=4$, so they lie on the horizontal line $y=4$.

Asked in: IMO

Practice more INTRODUCTION TO GRAPHS questions on Aicharya