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Andre45 [30]
3 years ago
10

What is the result of subtracting the second equation from the first?

Mathematics
1 answer:
Ronch [10]3 years ago
6 0

Answer:

-5x + 0y = -11

The y terms are eliminated

Step-by-step explanation:

- 4x – 2y = -2

X - 2y = 9

We want to subtract the second equation from the first

Distribute a minus sign to all the terms in the second equation

- 4x – 2y = -2  

X - 2y = 9

= (-5x + 0y = -11)

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10.3.23
Helga [31]

Answer:

The probability that a high school member selected at random is on the swim team is \frac{9}{40} = 0.225

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

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

In which

P(B|A) is the probability of event B happening, given that A happened.

P(A \cap B) is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: High school student.

Event B: Is on the swin team.

Probability of selecting a high school student:

Of the 1500 students, 200 are on high school. So

P(A) = \frac{200}{1500}

Probability of selecting a high school student who swims:

Of the 1500 students, 45 are high school students who swim. So

P(A \cap B) = \frac{45}{1500}

What is the probability that a high school member selected at random is on the swim team?

P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{\frac{45}{1500}}{\frac{200}{1500}} = \frac{45}{200} = \frac{9}{40} = 0.225

The probability that a high school member selected at random is on the swim team is \frac{9}{40} = 0.225

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    =-6/3

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