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
professor190 [17]
3 years ago
10

Use the substitution method to solve the system of equations

Mathematics
1 answer:
PilotLPTM [1.2K]3 years ago
3 0

You solve the substitution method to solve a system of equality by expressing one variable in terms of the other using one equation, and then plugging this expression in the other(s).

In this case, the first equation gives us a way to express n in terms of m. So, we can replace every occurrence of n in the second equation with the given formula.

The result is

14m+2n=-8 \iff 14m+2(-7m-4)=-8 \iff 14m-14m-8=-8 \iff -8=-8

So, the second equation turned to be an equality, i.e. an equation where both sides are the same.

This implies that the system has infinitely many solutions, because every couple (n,m) such that n=-7m-4 is a solution to the system, because it satisfies both equations: the first is trivially satisfied, whereas the second is an identity, and as such is satisfied by any value of the variable.

You might be interested in
A school dance committee is made up of 2 freshman, 4 sophomores, 2 juniors, and 2 seniors.
qaws [65]

Answer:

4 and 6.

Step-by-step explanation:

There are 4 different grades represented, so for the first question, there are 4 ways that the students can sit if they must sit together by grade.

For the second question, there are 3 grades other than senior level, so it starts with 3 ways that the students can be seated. 3 ways x 2 students per way = 6 ways

7 0
3 years ago
Factor completely.<br> 3x^2+30x+75=
mamaluj [8]
You write the problem as a mathematical expression
3x^2 + 30x + 75 =
Factor: 3 out of 3x^2 + 30x + 75.

3 (x2 + 10x + 25)

Factor using the perfect square rule.
And then your answer should be 3 ( x + 5) ^2
7 0
3 years ago
Read 2 more answers
Match the reasons to the statements in the proof. Given: m 1 + m 5 = 180° m 1 + m 4 = 180° Prove: | |
Elden [556K]

Answer and Step-by-step explanation:

Since we have given that

1. m∠1 + m∠5 = 180° and m∠1 + m∠4=180° - Given

2. m∠1 + m∠5 = m∠1 + m∠4 - Substitution

3. m∠5 = m∠4 -

Subtraction property of equality

4. Ray YZ is parallel to Ray UV - If alternate interior angles equal, then line are ||

3 0
3 years ago
Multiply. Enter the product in singlets form. 10/18x9/10=
Alexeev081 [22]

Answer:

1/2

Step-by-step explanation:

6 0
2 years ago
If a quadrilateral is a parallelogram, then its opposite sides are _____.
statuscvo [17]
The answer is letter c. 

<span>If a quadrilateral is a parallelogram, then its opposite sides are congruent. The congruence is the result of the Euclidean parallel postulate. 

</span>

<span>Thank you for posting your question. I hope you found what you were after. Please feel free to ask me more.</span>

3 0
3 years ago
Other questions:
  • What is -40 divided by (-5)
    8·1 answer
  • Solve −(3x − 2) = −4(x + 1) − 4.
    6·2 answers
  • The area of a rectangular wall of a barn is 140 square feet. Its length is 6 feet longer than twice its width. Find the length a
    9·1 answer
  • A biased coin is flipped 10 times. in a single flip of the coin, the probability of heads is 1/3 and the probability of tails is
    15·1 answer
  • -3(m-2n)=12;c someone please help
    5·1 answer
  • find the slope/ rate of change of the two points. Identify whether it is positive, negative, undefined or zero. (0,15) and (16,-
    5·1 answer
  • A water balloon is catapulted into the air so that its height h, in meters after t seconds is h(t) = -4t2 + 16t + 2.
    5·1 answer
  • Use deductive reasoning to tell whether each statement is true or false. If it is
    5·1 answer
  • A chef buys 6 pounds of salmon for $51. How much will he pay for 9 pounds of salmon?
    5·1 answer
  • The slope of the line below is -8/7 Write a point-slope equation of the line using the coordinates of the labeled point. (4,4)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!