book Maths Puzzle Numerical Ability

the sum of two numbers is 99. the difference of the two is 17. fin the numbers.

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book Other Question

An Indian sand painter begins his picture with a circle of dark sand. He then inscribes a square with a side length of 1 foot inside the circle. What is the area of the circle?

Thank you for your help! solve by graphing.

#1

x-y=3
x+y=5

#2

x+2y=6
2x-3y=26

#3

x=2y+4
y=2x-8

#4

x=y-1
3y=-2x-x