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aleksandrvk [35]
3 years ago
11

Follow the directions to solve the system of equations by elimination.

Mathematics
1 answer:
Ber [7]3 years ago
5 0
8x + 7y = 39
4x - 14y = -68

(multiply each term in second equation by -2)

8x + 7y = 39
-8x + 28y = 136

(add both equations)

35y = 175

(divide both sides by 35)

y = 5

(substitute value of y in one of the equations)

8x + 7(5) = 39
8x + 35 = 39
8x = 4
x = 1/2
(x, y) = (1/2, 5)
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Answer:

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Step-by-step explanation:

distribute -3 into the parenthesis

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add 21 on both sides

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4 0
3 years ago
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A certain lot consisting of ten items has three defective items and seven nondefective items. How many possible subsets of 2 ite
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Answer:

45

Step-by-step explanation:

The order in which the items are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

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Combinations of 2 from a set of 10. So

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4 0
3 years ago
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4 years ago
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Answer:

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