exam Maths Puzzle Numerical Ability

Please, please help? I need to solve by graphing:



x - y = 5 x + y = 3
x -2y = 8 x + y = -1

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exam Other Question
The sum of a number and -11 is 4. Find the number. f(x)=3x+2
g(x)=x^2

find (g o f) (x)