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
kondaur [170]
3 years ago
14

How do i solve equations by substitution?

Mathematics
1 answer:
r-ruslan [8.4K]3 years ago
4 0
Just doing one! Here's my problem:    x-y-11  x-3y=1

So when you subsitute everything it should look like this: 1y-11-3y=1 (There needs to be a one in front of the y because it's just always been there. they don't always put it in the eqation.)  You need to + the 11 and you have to do that to each side. So... 1y-11-3=1
                                                                                                                +11    +11
Now it should look like this: 1y-3y=12
Combine the 1y and -3y to get -4y=12      Last step is divide -4y and 12 by 4  . Answer is y=3
You might be interested in
Assume the world catch of fish in 1950 was 12 million tons and in 1955 it was 96 million tons.
Rama09 [41]

The rate of change is 16.8 million tons per year

<em><u>Solution:</u></em>

Given that, the world catch of fish in 1950 was 12 million tons and in 1955 it was 96 million tons

<em><u>The average rate of change is given by formula:</u></em>

\text{ Average rate of change } = \frac{\text{ change in value }}{\text{ number of years }}

Value in 1950 = 12 million tons

Value in 1955 = 96 million tons

Change in value = value in 1955 - value in 1950

Change in value = 96 million - 12 million = 84 million tons

Number of years = 1950 to 1955 = 5 years

<em><u>Substitute the given values in formula,</u></em>

<em><u></u></em>\text{ Average rate of change } = \frac{84 \text{ million tons}}{5} = 16.8 \text{ million tons}<em><u></u></em>

Thus rate of change is 16.8 million tons per year

5 0
3 years ago
I need help I don’t remember these
Levart [38]

4. Using the given formula, replace t with 8 seconds and multiply:

343 x 8 = 2,744 meters.

5. Domain is the X value, replace x with 1/4 and solve:

1/4^2 + 2 = 2 1/8

y= 2 1/8

6 0
3 years ago
In ΔQRS, the measure of ∠S=90°, the measure of ∠Q=29°, and SQ = 5 feet. Find the length of QR to the nearest tenth of a foot.
goldfiish [28.3K]

Answer:

2.8 feet

Step-by-step explanation:

tan(29)=x/5

5tan(29)=x

2.8=x

8 0
2 years ago
Read 2 more answers
If you get $2,000 for graduation gifts and invest it in an account that earns 1.5% interest
Eduardwww [97]

Answer:

It is VERY important to use the attached formula.

Years = ln (Total / Principal) / rate

Years = ln (6,000 / 2,000) / rate

Years = ln (3) / rate

Years = 1.0986122887 / .015

Years = 73.24 years

This takes a LONG time because the interest rate is extremely low.

Step-by-step explanation:

5 0
3 years ago
The assembly time for a product is uniformly distributed between 6 to 10 minutes. the expected assembly time (in minutes) is
Marta_Voda [28]
The expected assembly time is the middle of the range of the uniform distribution, 8 minutes.
7 0
3 years ago
Other questions:
  • Consider the system of inequalities and its graph.
    10·2 answers
  • A building is in the shape of a square pyramid. Each side of the base is 54 meters long and the height is 260 meters.
    5·1 answer
  • Proportion word problem.....One jar of crushed ginger costs $2. How many jars can you buy with $4?
    5·2 answers
  • What is 2 plus 2 plus 6 times 6
    13·2 answers
  • ∠A and ∠B\angle B∠B are supplementary angles. If m∠A=(8x−27)∘\angle A=(8x-27)^{\circ}∠A=(8x−27)∘ and m∠B=(4x+3)∘\angle B=(4x+3)^
    10·2 answers
  • 1. Convert 0.3 to a fraction and decimal.
    10·2 answers
  • The line segment joining A(6, 3) to B(–1, –4) is doubled in length by having half its length added to each end. Find the coordin
    12·1 answer
  • 18_ (-20) = -2 how do I figure out if it is add, subtract, multiply, or divide​
    9·1 answer
  • Find the x- and y-intercepts of the graph of 7x + 6y = 21. State your answers as
    7·1 answer
  • Find the value of x that makes m ∥ n.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!