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Bunuel
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x=y
1-4s=3s-1
2=7s
2/7=s
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Bunuel
If x = 1 - 4s and y = 3s - 1, the for what value of s does x = y ?

A. 7/2
B. 4/3
C. 1
D. 2/7
E. 0

Given: x = 1 - 4s and y = 3s - 1

Asked: What value of s does x = y ?

x = 1-4s = y = 3s -1
7s = 2
s=2/7

IMO D
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to make x=y
simply equate the values
i.e. 1-4s=3s-1
on solving the above equation we will get the value of s=2/7

to cross check the above result, we can substitute the value of s in both equation and obtain the value of x and y if they are equal then the answer is cross verified
i.e. in x=1-4s
x=1-4*(2/7)=-1/7
and in y=3s-1
y=3(2/7)-1=-1/7
hence for s=2/7; x=y
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Bunuel
If x = 1 - 4s and y = 3s - 1, the for what value of s does x = y ?

A. 7/2
B. 4/3
C. 1
D. 2/7
E. 0

Video Explanation



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