SOLUTION: Could you help me on this math problem it is 7-2x= 15;-4? I have to find out whether this is a solution or not,but this is what I did for this problem could you tell me if it is r

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Question 806319: Could you help me on this math problem it is 7-2x= 15;-4? I have to find out whether this is a solution or not,but this is what I did for this problem could you tell me if it is right or wrong? 7-2x= 15;-4
7-2(4)
7+8
15
x= -4 I think this is a solution
Am I right?
If not can you explain what i did wrong?
Thank you very much and may God Bless You! :)

Answer by solver91311(24713) (Show Source):
You can put this solution on YOUR website!

Yes, you are wrong. You substituted the value 4 when you were asked to use the value -4. Two different numbers. But then you did the arithmetic incorrectly and thereby inadvertently came up with the correct assessment that the number given is, indeed, an element of the solution set of the equation.

Here it is done correctly:

Since the result of the substitution is a true statement, the value is an element of the solution set.

Which god?

John

Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it