exam Maths Puzzle Numerical Ability

Once again, I need help in solving and understanding a statistics problem. Thanks in advance for your assistance in this matter!
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Please can someone help me. I am having trouble with this problem on a homework sheet.

3.) Write the series in summation notation. Use the index i and let i begin at 1 in each Graph each system of equations using the coordinate plane provided. Then determine whether the system has one solution, no solution, or infinitely many solutions. If the system has one solution, name it.
2x-y=-3
6x-3y=-9