How do you find the coordinate of a vector with the unit vector?

BlueRope
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If you already have one of the two coordinates?
 
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If ##x=x_1e_1+x_2e_2## and you know the value of ##x_1##, you can get the value of ##x_2## from ##x_2e_2=x-x_1e_1##.

Another option (if you understand inner products) is to just compute ##\langle e_2,x\rangle##.
 

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