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

The first side of a triangle is 8m shorter than the second side. The third side is 4times as long as the first side. The perimeter is 26m. Find the length of each side. An example of an invertible 1x1 matrix. An example of a noninvertible 2x2 matrix with 1s on the main diagonal.