if I am given this to solve:(adsbygoogle = window.adsbygoogle || []).push({});

Mx = b

where M

[0 0]

[1 2]

[0 0]

[3 6]

and b = [b1, b2, b3, b4]^{t}

does that mean I have vector x as 4 elements, i.e. x1-x4 or just x1 and x2?

thanks

edit: oh, wait... rank is 2, so its only x1 and x2, right?

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# Variables in a matrix

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