Question

If 2x + y = 7 and x + 2y = 8, find x + y without solving x + y​

Answer 1

Answer:

2x+y = 7

x+2y =8

2x+y=7

2x+4y = 16

3y =9

y=3

2x+3 = 7

2x =4

x = 2

x+y = 5

Answer 2

Answer:

Step-by-step explanation:

2x+y=7 is 1st equation and x+2y=8 is 2nd equation (say)

Add 1st and 2nd equations, we get

2x+y+x+2y =7+8

3x+3y = 15

3 (x+y) = 15

x+y = 15/3

x+y = 5 is the answer.