(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Vector a1 + vector a2 = 5*vector a3

Vector a1 - vector a2 = 3*vector a3

Vector a3 = 2i + 2j (i and j are the vector components)

Express 1) vector a1 and 2) vector a2 in unit vector notation

2. Relevant equations

Vector R = Ax + Yx

3. The attempt at a solution

I took the first equation and replaces the a3 with 2i+2j, so vector a1 + vector a2 = 5(2i + 2j)

a1 + a2 = 10i + 10j

I solved for R and found direction, but I do'nt believe that helps at all. (R = sqr root of 200 and direction was 45 degrees).

From the first equation with addition, I could conclude that vector a1 could equal = 10i +0j and vector a2 could equal 0i + 10j. However, these values don't work for the second equation with the subtraction. Is there some sort of secret to this problem?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Unit vector notation

**Physics Forums | Science Articles, Homework Help, Discussion**