Answer :

Solution

For this case we have this:

y= 2x -9 (1)

And replacing equation (1) into the second we got:

x + 2x -9= 12

3x = 12+9

3x = 21

x = 21/3 = 7

And solving for y we got:

y = 2*7 -9 = 14 -9 =5

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