Respuesta :

IF X+Y=15. AND y=2x-3.
X + 2X - 3 = 15.
6 + 2 (6) - 3 =15
6 + 12 -3 = 15
18 -3 = 15

Solve for X.
WOO!
X=6 :D
Now try to see if anything else can be X.

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