I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.
check your signs. The line is to the LEFT of the y axis.
In this question, the vector makes a 31 degree angle with the y-axis, not the x-axis. Also, remember that the x-value is negative. The correct answer is -3.09, 5.14 km.
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