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Question

What is the solution of the equation 3x+7y=30 if x=y?


A

(1,1)

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B

(2,2)

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C

(3,3)

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D

(4,4)

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Solution

The correct option is C

(3,3)


Substiuting x=y in the equation 3x+7y=30, we get
3x+7x=30.
10x=30
x=3
Thus, x=y=3.
In other words, (3,3) is a solution of the equation 3x+7y=30.


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