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2 years ago

what is the solution to this system of linear equations? 2x y = 1 3x – y = –6 (–1, 3) (1, –1) (2, 3) (5, 0)

Mathematics

2 answers:

Nitella [24]2 years ago

8 0

Hello,

2x+y=1
3x-y=-6

==>5x=-5
==>x=-1 and y=1-2*(-1)=3
Sol={(-1,3)}

Answer A

kicyunya [14]2 years ago

3 0

Answer:

Step-by-step explanation:

E2020...............................:)

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Country A has a growth rate of 4.9% per year. The population is currently 4 comma 151,000, and the land area of Country A is 1

kvv77 [185]

Answer:

There will be one person on 1 square yard of land after 1,892,147.588 years.

Step-by-step explanation:

Continuous exponential growth formula:

$P(t)=Pe^{rt}$

P(t)= Population after t years.

P= Initial population

r=rate of growth.

t= time in year

Given that,

Growth rate of country A (r)= 4.9% per year=0.049 per year.

Initial population (P)= 151,000.

Land area of country area= 14,000,000,000 square yards.

There will be one person on one square yard of land.

So, there will be 14,000,000,000 person for 14,000,000,000 square yard of land in country A.

P(t)=14,000,000,000 person

$\therefore 14,000,000,000= 151,000 e^{0.049t}$

$\Rightarrow e^{0.049t}=\frac{ 14,000,000,000}{ 151,000}$

Taking ln both sides

$\Rightarrow ln|e^{0.049t}|=ln|\frac{ 14,000,000,000}{ 151,000}|$

$\Rightarrow {0.049t}=ln|\frac{ 14,000,000,000}{ 151,000}|$

$\Rightarrow t}=\frac{ln|\frac{ 14,000,000,000}{ 151,000}|}{0.049}$

$\Rightarrow t}=1,892,147.588$ years

There will be one person for every square yard of land after 1,892,147.588 years.

7 0

3 years ago

If Sarah has 30 bills in her wallet worth $240, all fives and tens, how many of each bill does she have? help

Ivenika [448]

Answer:

12 fives and 18 tens

Step-by-step explanation:

solving this we need 2 different equations

one for he total bills and one for the total money

x+y=30

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5x+10y=240

combining both equations we can use elimination method and get

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zhuklara [117]

Answer:

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that means when it is 10 degrees Celsius, she won't wear her winter coat

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2 years ago

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Ilia_Sergeevich [38]

Answer:

Step-by-step explanation:

3x -2=5(2x+1)

3x-2=10x+5

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2 years ago

A scale model of a tiger measures 1.5 feet long. The Tigers actual length is 9 feet. What is the scale of the model?

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