Position vector and magnitude problem

[xgoddess210]

Homework Statement

A position vector in the first quadrant has an x-component of 6.0m and a magnitude of 10m

What is the value of its y-component?

Homework Equations

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The Attempt at a Solution

Well I originally thought I could draw a graph where x=6 and y=...then I realized i was solving for y. I don't know what the magnitude bit means. I thought it meant direction, but I don't see how that applies or would help me solve the problem. A little advice on how to solve this problem would be lovely!

 

[cse63146]

Treat this as a right angle triangle

The magnitude would be the hypotenuse in this case