exam Maths Puzzle Numerical Ability

The sum of two numbers is 18. If the sum of their squares is a minimum find the numbers.

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exam Other Question

The sum of two numbers is twice their difference. The larger number is 6 more than twice the smaller. Find the numbers. question 3x-y<6
x>1
y<3
Please solve graphically, P.S there is a line under each of the <,> symbols.

I thank you in advance for your help.