2x - y = 8
x + 2y = 4
For the system of equations above, what is the value
of x + y

x + y = 4

Step-by-step explanation:

2x - y = 8 | ×1 |

x + 2y = 4 | ×2 |

2x - y = 8

2x + 4y = 8

--

-5y = 0

y = 0/-5

y = 0

2x - y = 8

2x - 0 = 8

2x = 8

x = 8/2

x = 4

x + y

= 4 + 0

= 4

A) 2x - y = 8

B) x + 2y = 4  We multiply A) by two

A) 4x -2y = 16

B) x + 2y = 4  then add the equations

5x = 20

x = 4  

(then we put 4 into B)

4 + 2y = 4

2 y = 0

y = 0

Step-by-step explanation:

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step-by-step explanation: