if x + 2y = 9 and xy = 7, find the value of x + 4y.
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Answered by
1
Answer:
x=2 or 7
y=1 or 7/2
x+4y=53
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6
Now put this value of x in x+2y=9
Case 1. put y = 1 in x=7/y
x=7
Now put x= 7 and y= 1 in equation x+ 4y
= 7+4×1= 11
Case 2 put 7/2 in x= 7/y
x=2
Now put x= 2 and y= 7/2 in equation x+ 4y
=2 + 4× 7/2 = 2+14 = 16.
Value of x + 4y is 11 or 16
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