Question

5x+7y=17,7x+5y=19
Find the value of x+y

Answer 1

Hey !!!!

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According to the question, 

5x = 17-7y 

x = 17-7y/5

Putting this value in second equation, 

7(17-7y/5)+5y = 19

119-49y/5+5y/1 = 19

119-49y+25y/5 = 19

119 - 24y = 95

-24y = 95-119

-24y = -24

{- cancel out each other}

24y=24

y = 24/24

y = 1

Now, 

5x + 7y = 17

5x+7*1 =17

5x=17-7

5x = 10

x = 10/5

x = 2

Now, Adding x & y

x+y = ?

2+1 = 3

Hence, x+y = 3

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Hope This Helps.....!!!!