exam Maths Puzzle Numerical Ability

What would the coordinates be when solving this system by graphing?
3x + y = 6
3x + y = 0

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exam Other Question

Hello,

which would be the greatest common factor for each goup of terms for :

a) 48 , 36x

b) 9wx, 21wy, 15xy

thank you. Suppose A=QR, where Q and R are n*n, R is invertible and upper triangular, and Q has the property that (Q^T)Q = I. Show that for each b in R^n, the equation Ax=b has a unique solut