book Maths Puzzle Numerical Ability

How do I solve this problem by graphing it?

2x = y + 1
2x - y = 5

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book Other Question

Please help me solve this of x:
x^2=-5x-3 -------the +- means there is a + sign with a - under it

A)x=5+-sqrt13/2
B)x=5+-sqrt13
C)x=-5+-sqrt13/2
D)x=-5+-sqrt13

Please show me how you worked this out...thanks
I have to solve the inequality and then graph it.
4s-(3+55) (is less than or equal to) 17