Respuesta :

pegah
if you want to find x+y its gonna be easier to find each of them first so you can say : x+2y = 1                                                                          x + 2y = 1 
         2x + y = 5  ⇒ so you can multiply one of them by -2 ⇒ -4x - 2y = -10 
so both of the y are gonna be gone now you have :  -3x = -9 ⇒ x = 3 so y gonna be : 2(3) + y = 5 ⇒6 + y = 5 ⇒y = -1 niw you have both y and x so x+y gonna be :
3 - 1 = 2 :))) 
i hope this be helpful
* merry Christmas *
x+2y = 1       and        2x + y = 5

Let us first transform one equation.

x+2y = 1
  -2y     -2y

x= 1-2y

Now, we do the substitution method.

2(1-2y) +y = 5

Now solve for y.

2- 4y + 1y = 5
2 - 3y = 5 
-2       -2

-3y = 3
-3y/-3 = 3/-3
y= -1

Now we know that y= -1

Now we apply it to one equation to solve for x.

x+2(-1) = 1
x+-2 = 1
x-2=1
  +2   +2

x=3

Now we know that x= 3

Now we can apply it to the last equation.

x+y=?
3-1 = ?
3-1=2

Final answer: 3-1=2


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