v1 = (2 1 1 1)v2 = (0 1 1 3)

v1 and v2 are column vectors.

Ifc=(c1c2c3c4) is a row vector (i.e. a 1 by 4 matrix), what equations must be satisfied byc1; c2; c3; c4 in order thatcv1 andcv2 both be zero (as 1 by 1 matrices)?

I have no clue how to start, so any help would be great.