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kaheart [24]
2 years ago
12

Your grade.

Mathematics
1 answer:
svp [43]2 years ago
4 0

Answer:

y=3

Step-by-step explanation:

trust me bro

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Brass is made from a mixture of copper and other elements. a mixture that is 80% copper is combined with a mixture that is 60% c
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The equation that can be used to find x, the amount of the 60% mixture used to create the 65% mixture is:

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<h3>Which equation we should use?</h3>

First, let's define two variables:

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We know that we want to make 100 lb of 65% copper brass, then we must have that:

x + y = 100

And the percentage of copper before and after mixing must be the same, so we can write:

0.60*x + 0.80*y = 0.65*(x + y).

(where the percentages are written in decimal form).

Then we have a system of equations:

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0.60*x + 0.80*y = 0.65*(x + y).

To get a single equation, we can isolate the variable "y" on the first equation:

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Now we replace that in the other equation:

0.60*x + 0.80*(100 - x) = 0.65*(100).      

This is what we wanted to get, an equation that can be used to find x, the amount of the 60% mixture used to create the 65% mixture.

If you want to learn more about systems of equations:

brainly.com/question/13729904

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