exam Maths Puzzle Numerical Ability

How do I slove x+Y=-1 and 2x-y=-8
The problem says Find the Solution to the system by graphing

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exam Other Question

A line passing through (6, 9) and (5, y) is parallel to a line with slope 5. What is the value of y? simplify. one plus two-thirds over two plus one-half
1+2/3 over 2+1/2