1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
amm1812
3 years ago
5

[x + 3y = -4] [2x + 6y = 5]

Mathematics
1 answer:
stealth61 [152]3 years ago
3 0

Step-by-step explanation:

x+3y=-4(eqn1)

x=-4-3y

from (eqn 2)

2(-4-3y)+6y=5

-8-6y+6y=5

y=5+8=13.

y=13

from eqn 1

x+3(13)=-4

x+39=-4

x=-4-39

x=-43.

You might be interested in
If h(x) = (fog)(x) and h(x) = 4sqrt x+7, find g(x) if f(x) = 4sqrt x+1
lbvjy [14]
I hope this helps you

3 0
3 years ago
Help me with this question.
Elanso [62]
Answer : T = 2,116 miles
4 0
3 years ago
Total world consumption of iron was approximately 900 million tons in 1993. If consumption had increased by 2.5% each year and t
Lilit [14]

Step-by-step explanation:

We can model the annual consumption of iron by the equation

c = 900 million tons x 1.025^n, where

n is the number of years after 1993 and

c is the consumption for that year.

An estimate for the total consumption of iron can now be obtained by integrating this equation with respect to a dummy variable, x from 0 to n.

C = 900*10^6* \int\limits^n_0 {1.025^x} \, dx

This equation simplifies to

C = 900 million tons x (1.025^n - 1) / ln(1.025), where

x is a dummy variable and

C is the total consumption of iron n years after 1993.

Let R be the amount of iron remaining at n years after 1993, so

R = 480 billion tons - C

R = 480 billion tons - 900 million tons x (1.025^n - 1) / ln(1.025)

We need to find the value of n when R is 0, so

0 = 480 billion tons - 900 million tons x (1.025^n - 1) / ln(1.025)

Simplify this equation to obtain

n = 107.4

So the iron will run out in the year 1993 + 107 = 2100

6 0
2 years ago
Sarah has a collection of nickels, dimes, and quarters worth $28.75. She has 10 more dimes than nickels and twice as many quarte
Ymorist [56]

Answer:

Step-by-step explanation:

Write an equation for each statement:

:

"Sarah has a collection of nickels, dimes, and quarters worth $15.75."

.05n + .1d + .25q = 15.75

:

"She has 10 more dimes than nickels"

d = n + 10

:

"twice as many quarters as dimes."

q = 2d

:

How many coins of each kind does she have?

:

Take the 2nd equation and arrange it so n is in terms of d also

n + 10 = d

n = (d - 10)

:

In the 1st equation substitute (d-10) for n and 2d for q:

.05n + .1d + .25q = 15.75

:

.05(d-10) + .1d + .25(2d) = 15.75

:

.05d - .5 + .1d + .5d = 15.75

:

.65d - .5 = 15.75

:

.65d = 15.75 + .5

:

.65d = 16.25

:

d = 16.25/.65

:

d = 25 dimes

:

Remember the statement "twice as many quarters as dimes."

q = 2(25)

q = 50 quarters

:

The statement "She has 10 more dimes than nickels"

n = 25 - 10

n - 15 nickels

:

Check our solutions

.05(15) + .1(25) + .25(50) =

.75 + 2.50 + 12.50 = 15.75 proves our solutions

8 0
2 years ago
Write the standard equation of a circle with center (-4 0) and radius 3 brainly
den301095 [7]
(x-4)^2+(y-0)^2=3^2 is the answer
8 0
3 years ago
Other questions:
  • Simplify.<br> A12 over a7
    6·1 answer
  • The freshman and senior classes were surveyed on
    14·1 answer
  • the jumping team can jump 36 times in 9 seconds At this rate how many jumps can they make in 27 seconds
    13·1 answer
  • Which technique is most appropriate to use to solve each equation?
    15·1 answer
  • Real Answers | Brainliest | There are no images
    14·1 answer
  • What is the total weight of 3 bags if their individual weights are 2/5, 7/10, and 3/5 pounds? Give your answer as a mixed number
    14·1 answer
  • Select the antonym for the given word.
    10·2 answers
  • An instructor wants to compare final grades of students in her online class and face-to-face class. Instructor selects 10 studen
    7·1 answer
  • Clue is a board game in which you must deduce three details surrounding a murder. In the original game of Clue, the guilty perso
    11·1 answer
  • Hi can you please help me with my work​ no Link please no Link
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!