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White raven [17]
3 years ago
9

Use the elimination method to solve the system of equations. 3x+4y=8 X-Y=12

Mathematics
2 answers:
HACTEHA [7]3 years ago
8 0

Answer: D. (8, -4)

Step-by-step explanation:

3x + 4y = 8 --------------(1)

x - y = 12--------------(2)

eqn(2) × 3

3x - 3y = 36-----------(4)

eqn(4) - eqn(1)

-7y = 28

Divide bothside by -7

y = -4

Again, multiply eqn(2) by 4

4x - 4y = 48 ---------------(5)

eqn(5) + eqn(1)

7x = 56

Divide bothside by 7

x = 8

Therefore x=8 and y=-4

Margarita [4]3 years ago
5 0

STEP 1: Multiply second equation by -3.

After multiplying we have the following system:

3x+4y−3x+3y=8=−36

STEP 2: add the two equations together to eliminate x from the system.

7y=−28

STEP 3: find y

<u>y=−4</u>

<u></u>

STEP 4: substitute the value for y into the original equation to solve for x.

3x+4(−4)=8

<u>x=8</u>

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Step-by-step explanation:

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A particular electronic component is produced at two plants for an electronics manufacturer. Plant A produces 70% of the compone
Vesna [10]

Answer:

If a component received by the manufacturer is defective, the probability that it was produced at plant A is 0.5385 = 53.85%.

Step-by-step explanation:

We use the Bayes Theorem to solve this question.

Bayes Theorem:

Two events, A and B.

P(B|A) = \frac{P(B)*P(A|B)}{P(A)}

In which P(B|A) is the probability of B happening when A has happened and P(A|B) is the probability of A happening when B has happened.

In this question:

Event A: Defective component

Event B: Produced at plant A.

Plant A produces 70% of the components used

This means that P(B) = 0.7

Among the components produced at plant A, the proportion of defective components is 1%.

This means that P(A|B) = 0.01

Probability of a defective component:

1% of 70%(defective at plant A)

2% of 100 - 70 = 30%(defective at plant B). So

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If a component received by the manufacturer is defective, the probability that it was produced at plant A is

P(B|A) = \frac{0.7*0.01}{0.013} = 0.5385

If a component received by the manufacturer is defective, the probability that it was produced at plant A is 0.5385 = 53.85%.

4 0
3 years ago
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