Question

5x + 7y = 17 ; 7x + 5y = 19 then vlau of x + y = ?

option
1. 4

2. 2

3. 1

4. 7​

Answer 1

Answer:

x=2 and y=2

2+2=4

option 1

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Answer 2

Answer:

y=1 and x=-5

Explanation:

5x+7y=17_____1

7×+5y=19_____2

for equating y multiply eqn 1 by 7 and eqn 2 by 5

35x+49=119

35x+25y=95

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24y=24 .

=y=1 put this value in eqn 1

5x+7×1=17

=12×1=17

x=12-17

×=-5