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Here is the question

Find the distance from a vector $v=(2,4,0,-1)$ to the subspace $U\subset R^4$ given by the following system of linear equations:

$2x_1+2x_2+x_3+x_4=0$

$2x_1+4x_2+2x_3+4x_4=0$

do I need to find find a point $a$ in the subspace $U$ and write the vector $a-v$ and find the length of it?