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

Further Mathematics
WAEC 2022

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

  • A. -3i + 12j
  • B. -3i - 12j
  • C. -i + 12j
  • D. i - 12j
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Correct Answer: Option C
Explanation

→PQ = →PR + →RQ
→PR = →PQ  -  →RQ
→PR = -2i + 5j - (-i - 7j)
→PR = -2i + 5j + i + 7j
→PR = -i + 12j.

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