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SUBSTITUTION METHOD-- help ?!

What is the x-coordinate of the solution for the system of equations?


y - x = 9

10 + 2x = -2y


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x=

Verified Answer :

altavistard

If you want the x-coordinate of the solution of the system of lineare equations

y - x = 9
10 + 2x = -2y

then you must eliminate y from this sytem.  Rewrite the first equation:  y - x = 9 becomes y = x + 9.  Substitute this (x + 9) for y in  10 + 2x = -2y.  y will now be gone.  Solve the resulting equation for x and you'll be done.

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