If →PQ = -2i + 5j and →RQ = -i - 7j, find →PR

  • A -3i + 12j
  • B -3i - 12j
  • C -i + 12j
  • D i - 12j
waec 2022furthermathematics

The correct answer is C. -i + 12j

→PQ = →PR + →RQ

→PR = →PQ  -  →RQ

→PR = -2i + 5j - (-i - 7j)

→PR = -2i + 5j + i + 7j

→PR = -i + 12j.

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