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Simultaneous Linear Equations in Two Variables

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A landscaper wants to combine golden landscape rock with rust-colored landscape rock to make a mix. The golden rock costs $0.59 per pound and the rust-colored rock cost $0.49 per pound. If the landscaper buys 70 pounds of the mixture costing a total of $38.80, how much of the rust-colored rock did he buy?

___Pounds

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Solution Summary

This solution is comprised of detailed step-by-step calculation and explanation of the given problem. The solution also provides students with a clear perspective of the underlying mathematical concept.

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Let x be the amount of golden rock and y be the amount of rust-coloured rock

According to the given conditions,

x + y = 70 ...

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