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In which of the following systems can elimination
be used to eliminate a variable by performing
addition only?
O 2x - y = 8
x - 2y = 9
2x - y = 8
x – 2y = 9
2x - 4y = -2
| 5x - 2y = -2
o 2x + y = 8
3x - y = 4
O
O
O