Question

if 5x+7y=17,7x+5y=19 then the value of x-y is​

Answer 1

Answer:

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Step-by-step explanation:

Correct option is D)

5x+7y=17 ...(i)

7x+5y=19 ...(ii)

On multiplying (i) by 7 and (ii) by 5, we get

35x+49y=119

−

3

5x

−

+

25y=

−

9

5

24y=24

∴y=1

On putting y=1 in (i), we get

5x+7(1)=17

⇒x=2

∴x=2,y=1