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Elodia [21]
2 years ago
6

Solve for x: 3 - 2x = -7 A. 2 B. -5 C. 5 D. -2

Mathematics
1 answer:
kipiarov [429]2 years ago
6 0
Answer is a. 2
3 - 2x= -7
- 2x = -4
x = 2
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givi [52]

Given :

An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 50 g of an alloy containing 12% copper with 78 g of an alloy containing 92% copper.

To Find :

How many grams of copper are in the resulting mixture what percentage of the resulting mixture is copper.

Solution :

Mass of copper in 50 gm alloy = 50\times 0.12 = 6\ gram.

Mass of copper in 78 gm alloy = 78\times 0.98 = 76.44\ gram.

Total mass of copper, ( 6 + 76.44 ) gm = 82.44 gram.

Percentage of copper in resulting mixture :

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<u>I'll assume you need to find the equation of the line that passes through those points.</u>

Answer:

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The equation of a line passing through points (x1,y1) and (x2,y2) can be found as follows:

\displaystyle y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)

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Operating:

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Simplifying, the equation in point-slope form is:

\mathbf{\displaystyle y-2=\frac{1}{4}(x+4)}

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3 years ago
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