To eliminate one of the variables, you want to get the coefficients of one variable to be OPPOSITES.
You could multiply both sides of the first equation by 5, and multiply both sides of the second equation by 7. That would make the coefficients of the y-terms opposites:
5*2x + 5*7y = 5*11
7*3x - 7*5y = 7*15
10x + 35y = 55
21x - 35y = 105
Now....add the equations together and see what you get.
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