x+y=670 7x+5y=3740 __________ -7x-7y=4690 -2y=-900

x+y=6707x+5y=3740 __________ -7x-7y=4690 -2y=-900 y=450 i don't get this at all, can somebody please explain? thanks(:
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my teacher: me:(1) x+y=670 " ? " (2) 7x+5y=3740 somebody please __________ explain this to me (1) -7x-7y=4690 step by step,
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-7x-7y= 4690
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