Answer:
3
Explanation:
the vector somewhat looks like this:
^
_\|_ the angle is 135 degrees, and the x component is -3
| To find the y component given the direction angle and x component, use the formula y_comp = tan(angle) * x_comp
tan (135 degrees) * -3 = 3
You can also use the graph and geometry, but that method is not recommended for beginners as it is very easy to make a mistake. The graph should be used to check if your answer makes sense.