exam Maths Puzzle Numerical Ability

Solve the system of linear equations graphycally:

2x-4y=8
1/2x+y=-4

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exam Other Question

Let u and v be vectors in Rn, and let T be a linear operator on Rn. Prove that T(n).T(v)=n.v if and only if A(transpose)=A(inverse), where A is the standard matrix for T. Can you help me with this problem?

Find the area of a rectangle that is 3 times as long as it is wide. Express your answer in terms of w, the width of the rectangle in feet.