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Zarrin [17]
2 years ago
10

X=5 2x-3y=4 How do I solve this equation

Mathematics
1 answer:
Xelga [282]2 years ago
4 0

Answer:

x = 5 \\  \\ 2x - 3y = 4 \\  \\ 2 \times 5 - 3y = 4 \\  \\ 10 - 3y = 4 \\  \\  - 3y = 4 - 10 \\  \\  - 3y =  - 6 \\  \\ y = 2

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Simplify each of the following<br>4.1.1 13a2 - 3b - 21a2 + 76​
Nataliya [291]

Answer:

−8a2−3b+76

Step-by-step explanation:

=13a2+−3b+−21a2+76

Combine Like Terms:

=13a2+−3b+−21a2+76

=(13a2+−21a2)+(−3b)+(76)

=−8a2+−3b+76

6 0
2 years ago
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Serga [27]
Just use the stats given and put them into the fomula

5 0
3 years ago
2.5% of a population are infected with a certain disease. There is a test for the disease, however the test is not completely ac
Aleks04 [339]

Answer:

P(disease/positivetest) = 0.36116

Step-by-step explanation:

This is a conditional probability exercise.

Let's name the events :

I : ''A person is infected''

NI : ''A person is not infected''

PT : ''The test is positive''

NT : ''The test is negative''

The conditional probability equation is :

Given two events A and B :

P(A/B) = P(A ∩ B) / P(B)

P(B) >0

P(A/B) is the probability of the event A given that the event B happened

P(A ∩ B) is the probability of the event (A ∩ B)

(A ∩ B) is the event where A and B happened at the same time

In the exercise :

P(I)=0.025

P(NI)= 1-P(I)=1-0.025=0.975\\P(NI)=0.975

P(PT/I)=0.904\\P(PT/NI)=0.041

We are looking for P(I/PT) :

P(I/PT)=P(I∩ PT)/ P(PT)

P(PT/I)=0.904

P(PT/I)=P(PT∩ I)/P(I)

0.904=P(PT∩ I)/0.025

P(PT∩ I)=0.904 x 0.025

P(PT∩ I) = 0.0226

P(PT/NI)=0.041

P(PT/NI)=P(PT∩ NI)/P(NI)

0.041=P(PT∩ NI)/0.975

P(PT∩ NI) = 0.041 x 0.975

P(PT∩ NI) = 0.039975

P(PT) = P(PT∩ I)+P(PT∩ NI)

P(PT)= 0.0226 + 0.039975

P(PT) = 0.062575

P(I/PT) = P(PT∩I)/P(PT)

P(I/PT)=\frac{0.0226}{0.062575} \\P(I/PT)=0.36116

8 0
3 years ago
2
Rama09 [41]

Answer:

(-1,4)

Step-by-step explanation:

mp=xi+xii/2,yi+yii/2

7+-9/2=-1

0+8/2=4

=(-1,4)

5 0
3 years ago
Divide 72 in a ratio of 1:3:5
likoan [24]
<span>1+3+5 = 9

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</span><span>72 in a ratio of 1:3:5 = 8:24:40</span>
6 0
3 years ago
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