How to flip QPainter y-axis?

Determine that vector which when added to the resultant of 3i-5j+7k and 2i+4j-3k gives unit vector along yaxis?

  • explain the process please...

  • Answer:

    So the resultant is just the addition of those two vectors, right: 3i - 5j + 7k + 2i + 4j - 3k = 5i - j + 4k --> now what do you add to that to get 0i + 1j + 0k Subtract 5 from x-component: -5i Subtract 4 from z-component: -4k Add 2 to y-component: -1 + 2 = 1 --> use 2j So add -5i + 2j - 4k to resultant to get a unit vector (of length 1) along y-axis

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