# Homework Help: Linear Combinations Help

1. Mar 20, 2006

### Hollysmoke

The question is to write the following vectors as a linear combination:

c) a vector directed at an angle of 45 degrees with a magnitude of square root of 2.

d)a vector directed at an angle of 150 degrees with a magnitude of 6.

What I tried to do is to find the scalar quantity with the vector but I'm not getting a right answer. Could someone please help me in the right direction?

2. Mar 20, 2006

### Muzza

As a linear combination of what?

3. Mar 20, 2006

### Hollysmoke

oh sorry. i+j

4. Mar 20, 2006

### Hollysmoke

i and j. not i+j.

5. Mar 20, 2006

### Hollysmoke

does anyone know any website that I could use as a tutorial, then?

6. Mar 20, 2006

### arunbg

Hint:First find a unit vector in the given direction using direction cosines.
Then multiply by magnitude.

7. Mar 20, 2006

### HallsofIvy

8. Mar 20, 2006

### Hollysmoke

Thank you for the websites and thank you for the help. I figured it out with that hint :D