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ipn [44]
3 years ago
12

Solve the system 2x + 3y = -6 and 3x - 2y = 11

Mathematics
2 answers:
Usimov [2.4K]3 years ago
8 0

Answer:

Step-by-step explanation:

kap26 [50]3 years ago
8 0

2x + 3y =  - 6 \\  \\ 1. \: 2x =  - 3y - 6 \\ 2. \:  \frac{2x}{2}  =  \frac{ - 3y - 6}{2}  \\ x =  \frac{ - 3}{2} y - 3 \\ or \\ 1. \: 2x =  - 6 - 3y \\ 2. \: x =  \frac{ - 6 - 3y}{2}  \\ 3. \: x =  \frac{ - 3(2 + y)}{2}  \\ 4. \: x =  -  \frac{3(2 + y)}{2}  \\  \\  \\ 3x - 2y = 11 \\ 1. \: 3x = 2y + 11 \\ 2. \:  \frac{3x}{3}  =  \frac{2y + 11}{3}  \\ x =  \frac{2}{3}y +  \frac{11}{3}   \\ or \\ 1. \: 3x = 11 + 2y \\ 2. \: x =  \frac{11 + 2y}{3}

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Jemina has 4 dogs, 8 cats and 12 fish as pets at her house.
eduard

Answer:

8:16

Step-by-step explanation:

6 0
2 years ago
What is the value of the sum of all the terms of the geometric series 300, 60, 12, …?
ruslelena [56]
<h3>Answer:   375</h3>

=========================================

Work Shown:

a = 300 = first term

r = 60/300 = 0.2 = common ratio

We multiply each term by 0.2, aka 1/5, to get the next term.

Since -1 < r < 1 is true, we can use the infinite geometric sum formula below

S = a/(1-r)

S = 300/(1-0.2)

S = 300/0.8

S = 375

----------

As a sort of "check", we can add up partial sums like so

  • 300+60 = 360
  • 300+60+12 = 360+12 = 372
  • 300+60+12+2.4 = 372+2.4 = 374.4
  • 300+60+12+2.4+0.48 = 374.4+0.48 = 374.88

and so on. The idea is that each time we add on a new term, we should be getting closer and closer to 375. I put "check" in quotation marks because it's probably not the rigorous of checks possible. But it may give a good idea of what's going on.

----------

Side note: If the common ratio r was either r < -1 or r > 1, then the terms we add on would get larger and larger. This would mean we don't approach a single finite value with the infinite sum.

3 0
3 years ago
A rectangular floor is 18ft long and 12 ft wide. Lamar wants to carpet the floor with carpet tiles sold by square yard. Use the
WITCHER [35]

Solution

The dimension of the rectangular floor is 18ft long and 12 ft wide

Using the conversion table

It is given that 1yd =3 ft

This shows that

12 feet will be equivalent to

\frac{12}{3}=4yd

Also 18ft will be equialent to

\frac{18}{3}=6yd

Therefore the new dimension is 6 yard by 4 yard

The area will be

A=6\times4

Therefore the required area is

A=24yd^2

5 0
1 year ago
What is the rate of change seen in the graph below?
Harrizon [31]

Answer:

0

Step-by-step explanation:

the answer is 0

because it neither rises nor fall

6 0
3 years ago
Read 2 more answers
Verify the property: a ×( b+c ) = ( a×b ) + ( a×c ) by taking a = 3/5 , b = -2 , c = 10/13
Ivanshal [37]

Answer:

This is the distributive property

Step-by-step explanation:

You use the distributive property to allocate a number outside of the parentheses to inside the parentheses.

For this example, they distributed a to both b and c making it a*b + a*c

This will result in the same answer:

3/5(-2 + 10/13) = 3/5*-2 + 3/5*10/13

3/5(-1.23..) = -6/5 + 30/65 (..= approx)

approximately- 0.74  = -0.74

6 0
3 years ago
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