book Maths Puzzle Numerical Ability

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

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book Other Question

Find all values of w satisfying the equation:

3w/w-2 = -27/w^2 - 8w + 12 If the number of square units in the area of circle C is twice the number of linear units in the circumference of C, what is the number of square units in the area?
(A) 4
(B) 8
(C) 4π
(D) 8π
(E) 16π