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Question

x=5,y=2 is a solution of the linear equation

A
x+2y=7
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B
5x+2y=7
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C
x+y=7
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D
5x+y=7
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Solution

The correct option is C x+y=7
The solution should satisfy the appropriate equation.
So, let us investigate each option by substituting x=5 & y=2
Option A, x+2y=7.
L.H.S. =5+2×2=9 R.H.S.
It is not the appropriate equation.
Option B, 5x+2y=7
L.H.S. =5×5+2×2=29 R.H.S.
It is not the appropriate equation.
Option C, x+y=7 L.H.S. =5+2=7= R.H.S
It is the appropriate equation.
Option D, 5x+y=7 L.H.S. =5×5+2=27 R.H.S.
It is not the appropriate equation.
Hence, option C is correct.

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