Vectors

**ziane0210** · February 11th 2011, 05:26 PM

Can anyone help me with this problem:

**Ackbeet** · February 11th 2011, 05:28 PM

This is more of a pre-calc or algebra question, just fyi. You can report your own post (use the little triangle symbol with the exclamation mark in it), and a mod will move it for you.

What ideas have you had so far?

**Prove It** · February 11th 2011, 06:46 PM

(ii) Try evaluating the dot product...

**HallsofIvy** · February 12th 2011, 04:13 AM

Any vector that is parallel to $\vec{i}+ 2\vec{j}$ is of the form $a\vec{i}+ 2a\vec{j}$ . Any vector that is perpendicular to $3\vec{i}+ \vec{j}$ is of the form $b\vec{i}- 3b\vec{j}$ . Find a and b so that $a\vec{i}+ 2a\vec{j}+ b\vec{i}- 3b\vec{j}= \vec{i}+ \vec{j}$

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