exam Maths Puzzle Numerical Ability

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

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What would the coordinates be when solving this system by graphing?
3x + y = 6
3x + y = 0 The area of a rectangle is 24 square meters.Find the length and width of the rectangle if its length is 2 meters greater than its width. Use an equation and the formula---->area of the rectangle=(width)(length).