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
3x15=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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