Solving systems by substitution and elimination?

Solving systems by substitution and elimination?

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\[y = \frac{ 1 }{ 2 }x - 6\] 2x + 6y = 19

I know that answer is (11, -1/2) but I don't know how to solve it.

So, you know what y equals. If you see y in another equation can't you just plug it in?

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