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nignag [31]
3 years ago
14

2x+3y=3 and -10x+2y=-32

Mathematics
1 answer:
lawyer [7]3 years ago
3 0

2x + 3y = 3

-10x + 2y = -32


Solve using the substitution method.

Solve for x in the first equation.


2x + 3y = 3

Subtract 3y from both sides.


2x = 3 - 3y

Divide both sides by 2.


x = \frac{3}{2} - \frac{3}{2}y

Plug x into the second equation.


-10(\frac{3}{2} - \frac{3}{2}y) + 2y = -32

Distribute -10 inside the parentheses.


-15 + 15y + 2y = -32

Combine like terms.


-15 + 17y = -32

Add 15 to both sides.


17y = -17

Divide both sides by 17.


y = -1

Plug y into the first equation.


2x + 3(-1) = 3

Multiply 3 by -1.


2x - 3 = 3

Add 3 to both sides.


2x = 6

Divide both sides by 2.


x = 3


x = 3;

y = -1

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2 years ago
Put these in order from least to greatest 1/2, 1/3, 2/5, 0.6 , o.3
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0.3, 1/3, 2/5, 1/2, 0.6

Step-by-step explanation:

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According to police sources, a car with a certain protection system will be recovered 87% of the time. Find the probability that
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Answer: 0.01145

Step-by-step explanation:

We use Binomial distribution , where the probability of getting x successes in n trial is given by :-

P(x)=^nC_xp^x(1-p)^{n-x} , p = probability of getting each success in each trial.

As per given

The proportion that a car with a certain protection system will be recovered= p=0.87

n= 8

Let x be the number of cars will be recovered.

Then, the probability that 4 of 8 stolen cars will be recovered:

P(X=4)=^8C_4(0.87)^4(1-0.87)^{8-4}

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3 years ago
Item 1 A bag contains 7 blue cards, 4 green cards, 6 red cards, and 8 yellow cards. You randomly choose a card. a. How many poss
egoroff_w [7]

Answer:

4 possible outcomes

Step-by-step explanation:

we know that

The probability of an event is the ratio of the size of the event space to the size of the sample space.  

The size of the sample space is the total number of possible outcomes  

The event space is the number of outcomes in the event you are interested in.  

so  

Let

x------> size of the event space

y-----> size of the sample space  

so

P=\frac{x}{y}  

In this problem

<em>The probability of choose a blue card is </em>

x=7

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substitute

P=\frac{7}{25}

<em>The probability of choose a green card is </em>

x=4

y=7+4+6+8=25

substitute

P=\frac{4}{25}

<em>The probability of choose a red card is </em>

x=6

y=7+4+6+8=25

substitute

P=\frac{6}{25}

<em>The probability of choose a yellow card is </em>

x=8

y=7+4+6+8=25

substitute

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\frac{7}{25}+\frac{4}{25}+\frac{6}{25}+\frac{8}{25}=\frac{25}{25} ----> represent the 100%

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