HI

Can someone tell me how would i complete the following question:

If $\displaystyle a=2i-3j+k, b=2i-4j+5k $and $\displaystyle c=-i-4j+2k $find the values of p and q such that a+pb+qc is parallel to the x-axis.

This is what i just started:

$\displaystyle 2i-3j+k+p(2i-4j+5k)+q(-i-4j+2k)

$

P.S