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Precalculus Mathematics Homework Help
How much of a 5 gallon 40% salt solution should be replaced
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[QUOTE="RUber, post: 5504316, member: 524408"] If you were going to build a system of equations, you would do something like: ## \frac{0.40x + 0y }{x+y} = 0.15 \\ x+y = 5, ## where x is the volume of 40% solution and y is the volume of pure water. To write this as a matrix equation, it would look like: ##\begin{bmatrix} 0.4& 0 \\ 1 & 1 \end{bmatrix} \begin{bmatrix} x\\ y \end{bmatrix} = \begin{bmatrix} .75\\ 5 \end{bmatrix}## However, this is a very simple system and you were able to solve it without using Cramer's rule. The simplified system works out to exactly what you did above: ##0.40 x = .75\\ x+y = 5.## [/QUOTE]
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Precalculus Mathematics Homework Help
How much of a 5 gallon 40% salt solution should be replaced
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