Posted by **Sarah** on Friday, June 15, 2012 at 12:18am.

Determine the value of k, so that u = [-3,7] and v = [16,k] are perpendicular.

- Calculus -
**broday**, Friday, June 15, 2012 at 12:52am
they're parallel

- Calculus -
**Sarah**, Friday, June 15, 2012 at 1:06am
it says determine the value of k so that u and v ARE perpendicular .... if it was parallel, i don't think it would ask me to find k....... unless it's a trick question ...

- Calculus -
**Damon**, Friday, June 15, 2012 at 2:43am
slope of u = -7/3

so slope of perpendicular to u = +3/7

so

3/7 = k/16

7 k = 48

k = 48/7

- Calculus -
**Reiny**, Friday, June 15, 2012 at 7:52am
or...

their dot product must be zero

(-3)(16) + 7k = 0

7k = 48

k = 48/7

- Calculus -
**Henry**, Monday, June 18, 2012 at 6:05pm
thank you everyone

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