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
kipiarov [429]
3 years ago
12

PLEASE HELP!!!!!!!!!

Mathematics
1 answer:
Phantasy [73]3 years ago
6 0

Part A : Substitution

Elimination

Argumentated matrices.

Part B :

1. Substitution is a method of solving systems of equations by removing all but one of the variables in one of the equations and then solving that equation. This is achieved by isolating the other variable in an equation and then substituting values for these variables in other another equation.

2. Elimination is another way to solve systems of equations by rewriting one of the equations in terms of only one variable. The elimination method achieves this by adding or subtracting equations from each other in order to cancel out one of the variables.

3. Augmented matrices can also be used to solve systems of equations. The augmented matrix consists of rows for each equation, columns for each variable, and an augmented column that contains the constant term on the other side of the equation.

Part C :

7x +y = 14

5x + y = 4

X= 5 and y = - 21

Hope this Helps : )

You might be interested in
1) Working alone, Beth can tar a roof in 151
Pachacha [2.7K]

Answer:

A) 7.24 hours

Step-by-step explanation:

The together rate is the sum of each separate rate.

In this problem:

Beth's rate is 1/15(suppose there was a small typing mistake there, with 151 none of the options are correct).

Mike's rate is 1/14

The together rate is 1/x

Then

We want to find x.

\frac{1}{15} + \frac{1}{14} = \frac{1}{x}

15*14 = 210. So

\frac{14 + 15}{210} = \frac{1}{x}

\frac{29}{210} = \frac{1}{x}

Cross multiplication

29x = 210

x = \frac{210}{29}

x = 7.24

So the correct answer is:

A) 7.24 hours

8 0
2 years ago
Abby scored 87, 86, 93, and 89 on her first four history quizzes. What score does Abby need to get on her fifth quiz to have an
Delicious77 [7]

Answer:

(C) 100

Step-by-step explanation:

The average of a data set is just all the numbers added up divided by the amount of numbers.

If we already have 4 pieces of data and we're looking for one more, we have 5 data pieces.

This means that the sum of all of the numbers in the data set will be 91\cdot5=455 if the mean is 91.

We can find the missing value by adding up what we know and subtracting from 455.

87+86+93+89=355\\\\455-355=100

So Abby needs a 100% on her fifth history quiz to have an average of 91 on all her quizzes.

Hope this helped!

4 0
3 years ago
Y=6*46x for x=-3 =? a)3/32 b)3/8 c)-72 d)3/128
sergey [27]
- 828 is your answer
3 0
2 years ago
(4z^5 - 14z^4 + 10z^3 - 16z^2 + 41z - 2) / (z - 2)
r-ruslan [8.4K]

Answer:

4z4−6z3−2z2−20z+1

Step-by-step explanation:

4z5−14z4+10z3−16z2+41z−2

z−2

=

4z5−14z4+10z3−16z2+41z−2

z−2

=

(z−2)(4z4−6z3−2z2−20z+1)

z−2

=4z4−6z3−2z2−20z+1

(theres no more like terms so u cant)

4 0
2 years ago
In rectangle nice, the base is 2x and the height is x+1. the perimeter is 53 feet. find the height
mihalych1998 [28]
The perimeter equation for a rectangle is two times the base plus two times the height.
2B + 2H=P

Plug in the known values and solve for x.
2(2x) + 2(x+1)=53
4x+2x+2=53
6x=51
x=8.5

Now that we know what x is, put it back into the formula for the height of the rectangle to find the final answer.
H= x+1
H=8.5+1
H=9.5 ft
4 0
2 years ago
Other questions:
  • Solve the equation 4/3(3) ^x =108
    10·1 answer
  • Please help me figure this out!
    15·2 answers
  • Which number below is 9 a common factor of 16 and 20?
    8·1 answer
  • A coin is tossed. The probability of getting tails is 1?2. What is the likelihood of getting tails?
    10·1 answer
  • Please help ASAP thank you!
    11·2 answers
  • a 30% sugar syrup is mixed with 10% sugar syrup.The result is 600 g of 15% sugar syrup. How many grams of each syrup are in the
    11·2 answers
  • What is 5 yards rounded to the nearest tenth
    11·2 answers
  • Using the pencil, plot the point (-1,-5).
    7·1 answer
  • What is the exponential form of the following expression?<br> (–5)(–5)(–5) · c · c · c
    11·1 answer
  • A holiday meal cost $12.50 a person plus a delivery fee of 30$. Which equation is right?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!