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Question

In the equation
ax+by+c=0,
if y=(cx+d)b
and a = d,
then what is the value of x ?

A
-1
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B
-2
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C
(d+c)(a+c)
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D
(dc)(a+c)
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Solution

The correct option is A -1
Given,
y=(cx+d)b and a=d

Putting the given values of
y and a in ax+by+c=0,
dx+b(cx+db)+c=0
dx+cx+d+c=0
(c+d)x+(c+d)=0
x=(c+d)(c+d)=1

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