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
HACTEHA [7]
3 years ago
10

Please help me its about solving system by substitution

Mathematics
1 answer:
yKpoI14uk [10]3 years ago
8 0

Answer:

x = 2 and y = 5

Step-by-step explanation:

Given

x = y - 3.....i)

2x + 3y = 19.........ii)

Putting x = y - 3 in equation II)

2( y - 3 ) + 3y = 19

2y - 6 + 3y = 19

5y = 19 + 6

5y = 25

y = 25 / 5

y = 5

Now putting y = 5 in equation i)

x = 5 - 3

x = 2

Hope it will help :)❤

You might be interested in
The dollar value of a car is a function f, . of the number of years, t, since the car was purchased. Thefunction is defined by t
Fofino [41]

Given the following question:

f(t)=12000\times(\frac{3}{5})^t

Part A:

I believe that the 12,000 tells us the orginal price of the car, or the price the car was purchased for. 12000 is the orginal price of the car.

Part B:

I believe that the 3/5 tells us the decline in value each year after the car has been purchased. Which is why t is the exponet is t was 2 you would have to multiply 3/5 by itself twice and then multiply it by 12000 which further decreases it's value. 3/5 represents the decline in value after T years.

Part C:

t = number of years

t = 3

\begin{gathered} f(t)=12000\times\frac{3}{5^{}}^3 \\ \frac{3}{5}^3=\frac{3}{5}\times\frac{3}{5}\times\frac{3}{5} \\ \frac{3}{5}\times\frac{3}{5}=\frac{9}{25} \\ \frac{9}{25}\times\frac{3}{5}=\frac{27}{125} \\ 12000\times\frac{27}{125}=2592 \\ v=2592 \end{gathered}

Value of the car after three years will be 2592.

4 0
2 years ago
Find a polynomial with zeros at x=2,x=-1 and x=0
Amiraneli [1.4K]

Answer:

f(x) = x^3 - x^2 -2x

Step-by-step explanation:

If x = a is a zero of a polynomial, then x-a is a factor of the polynomial. Given the factors of a polynomial, the polynomial can be obtained by multiplying the factors.

The factors of the given polynomial are;

x - 2

x + 1

x

Multiplying the first two factors;

(x-2)(x+1) = x^2 + x -2x -2

              = x^2 -x -2

We finally multiply this result by x to obtain our polynomial;

f(x) = x ( x^2 -x -2)

      = x^3 - x^2 -2x

which is a cubic polynomial since it has 3 roots.

5 0
3 years ago
Read 2 more answers
The ratio of pencils to erasers is 4:1 if there are 20 pencils how many erasers are there?
shusha [124]
If the ratio is 4:1 , pencils being the 4 and erasers being the 1, there are 4 pencils for every 1 eraser. Now, substitute the 4 pencils for 20 pencils. How do you get to 20 from 4? multiply by 5. You multiply the 4 pencils by 5 to get 20, and u multiply the 1 eraser by 5 to get 5, so there are 20 pencils: 5 erasers
8 0
3 years ago
A certain city has 2160 pets. Of these pets, 1/4 are cats, 1/5 are dogs, 1/10 are horses, 1/9 are frogs, 1/4 are are fish, and t
SOVA2 [1]
Total pets/5=dog
2160/5=432

7 0
3 years ago
The nth term of a sequence is given by 12 - 5n.<br> Write down the first 3 terms of the sequence.
zysi [14]

Answer:

              \bold{a_1=7\,,\quad a_2=2\,,\quad a_3=-3}

Step-by-step explanation:

                                      a_n=12-5n\\\\\\a_1=12-5\cdot1=12-5=7\\\\a_2=12-5\cdot2=12-10=2\\\\a_3=12-5\cdot3=12-15=-3

6 0
3 years ago
Other questions:
  • Notebooks cost $1.20 each. This weekend they will be at a sale on for $.80, what percentage is the sale??
    14·1 answer
  • After school, Camille had a science club meeting for 1 hour, followed by a choir rehearsal that lasted for 40 minutes. If Camill
    7·2 answers
  • Suppose you roll two six-sided dice, one red and one blue. Each is labeled 1 through 6. What is the probability that you roll a
    11·1 answer
  • Took Gage 1 of a gallon of paint to create a mural of his favorite team the Grizzlies. He was asked to replicate his mural for 8
    14·1 answer
  • Choose an equation of a line through the point (-4, 1) perpendicular to y=−12x+3.
    14·1 answer
  • In each of the following, find the area of the shaded region.
    13·1 answer
  • A truck driver drove 13 hours and earned $520. What is the hourly rate?
    14·2 answers
  • How much faster does Student B read than Student A?
    15·1 answer
  • Here is the problem<br> Plz help <br> My brain hurts????????????????
    8·1 answer
  • Decrease £40 by 25% <br> (Hegarty maths)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!