Four-quadrant coordinates

The question

C=

Point C

How it works.

0112233445566
  1. 01

    Start at the corner where the two lines meet — that is (0, 0).

  2. 02

    Go along the bottom first: count -1 across.

  3. 03

    Then up: count -4.

  4. 04

    So point C is (-1, -4) — -1 across, then -4 up.