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In order to eliminate the variable "y" when adding the two equations together, Tatum should multiply the second equation by 3.
This will result in:
6x + 3y = 14
9x + 6y = 30
When adding them together, the "y" variable will be eliminated:
(6x + 3y) + (9x + 6y) = 14 + 30
15x + 9y = 44