exam Maths Puzzle Numerical Ability

Can you please show me how to solve the system by addition?
x+y=9
x-y=9

Thank you

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exam Other Question

2 1 1
5 4 1

2 1 1
3 3 _

I am suppose to find the missing number in the second matrix by using row operation. Can you solve : Find the equation of the line in slope intercept form that passes through the point (2,5) and is perpendicular to the line 3x-4y =1

Thank you