Homework Help: Math / Linear Equations

Posted by Ashley on Saturday, July 30, 2011 at 7:02pm.

I was looking on a website that teaches linear algebra and it had this problem:

3x - 15
_______ =0

2x + 1

And it says the answer is: x = 5

But I don't understand how to get that answer so I hope someone can give me step by step directions for it.

Math / Linear Equations - MathMate, Saturday, July 30, 2011 at 7:33pm
As long as x≠-1/2, the denominator is not zero. In that case, the only way for the expression to be zero is when the numerator becomes zero, or
3x-15=0, which gives x=5 as the root.

In the case when x=-1/2, the expression becomes undefined, and no solution is possible.

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