if 7x + 8y =11 and 8x + 7y =9 then x-y = ?
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2
Answer:
Rewriting the given equations, we get
8x−7y=11 ...(i)
7x−8y=4 ...(ii)
On adding (i) and (ii) , we get
15x−15y=15
⇒x−y=1
On subtracting (ii) from (i), we get
x+y=7
Answered by
1
Answer:
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