book Maths Puzzle Numerical Ability

x-y=7
x+y=5


3x-y=9
2x+y=6


it say use linear combinations to solve

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book Other Question

The rectangle has a perimeter of 78 centimeters.the length of the rectangle is 11 centimeters longer than triple the width. Find the demensions of the rectangle Use synthetic division to divide x^4 + 4x^3 + 6x^2 + 4x + 1 by x+1