SOLUTION: If x + 2y = 11 and 3x + y = 13, then find the value of (x + y).

Question 252547: If x + 2y = 11 and 3x + y = 13, then find the value of (x + y).
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
This is a system of linear equations. Usually, you can subtract down or use some kind of multiplication and get the answer directly. In this case, we cannot.
(i)
(ii)
-----
step 1 - multiply (ii) by -2.
(iii)
(iv)
-----
step 2 - add down to eliminate the y.
(v) - -> X = 3.
If X = 3, then y = 4 and (X + Y) = 7.

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