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Question:
- If and x = 2y, then :
- (a) y = 1
- (b) x = 4
- (c) x = 2
- (d) y = 0
Answer:
Step-by-step explanation:
Given,
And,
Substituting the values,
We get,
Therefore,
We get,
Hence,
(b) x = 4 is correct answer.
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Answer:
• x^y=y^x
• x=2y
• x^y=y^x.........(i)
• x=2y........................(ii)
By substituting the value of x into the (i) equation we get,
or, ( 2y)^y=y^2y
or, 2^y× y^y=y^(y+y)
or, 2^y × y ^y=y^y × y^y
or, 2^y=y^y
So, y =2
Then, x =2y
or, x =2 × 2
So, x =4
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