book Maths Puzzle Numerical Ability

7. The sum of two numbers is 17 and the sum of their square is 145. Find the larger number.
a. 10 b. 11 c. 8 d. 9 e. none
The answer is D, but how? Please help me prepare for my

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book Other Question
Solve the system by graphing and state the coordinates of the solution in words:
x + y = 4 and -x + y = 2 using -1 as a factor (divide)

(x-4)^2
__________ =
(4-x)^2



thanx