Question

What is the value of x in the equation 3x – 4y = 65, when y = 4?

Answer 1

3x-4×4=65 (as y=4)
Or,3x-16=65
Or,3x=65+16
Or,3x=81
Or,x=81/3
Or,x=27

Answer 2

Answer:

$If \: y =4 , \: then \: value \: of \: x = 27$

Step-by-step explanation:

$Given,\\Linear \: equation \: \\in \: two \: variables \: x \: and \: y \: is\: \\3x-4y=65 , \: y=4$

$Substitute \: y = 4 \: in \: the \: equation\:, we\: get$

$3x-4\times 4=65\\\implies 3x-16=65\\\implies 3x=65+16\\\implies 3x=81\\\implies x=\frac{81}{3}\\\implies x=27$

Therefore,

$If \: y =4 , \: then \: value \: of \: x = 27$

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