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
notsponge [240]
3 years ago
6

Please use method of substitution numbers 9;10;11;12

Mathematics
1 answer:
rodikova [14]3 years ago
5 0

Answer:

1.    x = 1, y = 2.

12.  x = 1, y = -3.

Step-by-step explanation:

I won't do all these for you, just the first and the last. The method is similar  for all 12.

1.

y = x + 1

x + y = 3

Substitute y = x + 1 into the second equation:

x + y = 3 so:

x + (x + 1) = 3

2x + 1 = 3

2x + 1 -1 = 3 - 1

2x = 2

x = 1.

Now substitute x = 1 into the first equation to get the value of y:

y = x + 1

y = 1 + 1

y = 2.

12.

4x = y + 7

3x + 4y + 9 = 0

Solve for y in the first equation:

4x = y + 7                Subtract 7 from both sides of the equation:

4x - 7 = y + 7 - 7

y = 4x - 7.

Now substitute  y = 4x - 7 in the second equation:

3x + 4y + 9 = 0   so:

3x + 4(4x - 7) + 9 = 0

3x + 16x - 28 + 9 = 0

19x - 19 =  0

19x - 19 + 19 = 0 + 19

19x = 19

x = 19/19 = 1.

Now substitute x = 1 in the first equation:

4x = y + 7

4*1 = y + 7              Subtract 7 from both sides of the equation:

4 - 7 = y + 7 - 7      

-3 = y.

You might be interested in
Hello! i need help! I Am a 5th grade scholar
stich3 [128]

0.4 is 10 times as much as 0.04

this is because 0.04 times 10 is 0.4

0.003 is 1/10 of 0.03

0.003 times 10 is 0.03

6 0
3 years ago
PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ HELPPPPPPPPPPPPP ME PLZ SHOW YOUR WORK
xeze [42]

Answer:

6

Step-by-step explanation:

I wrote it super fast. lol

can you get it?

4 0
3 years ago
The temperature in montral was -8 degrees celsius. In new york the temperature was 11 degrees celsius. How many degrees warmer w
yulyashka [42]

Answer

-19

Step-by-step explanation:

AS  WE NEED TO FIND THE DIFF SO -8-11=-19

3 0
3 years ago
HELP PLEASE!!!!
Anestetic [448]
<span>To find her take home pay, you subtract her deductions from her gross pay and then divide her take-home pay by her gross pay and then multiply by 100%.
So,
</span><span>Take-home pay = 2644-548.30=2095.70 Percent = (2095.70/2644)*100%=79.262%
So your answer is </span><span>B)79%
</span><span>Hope this helps :)
If you need anymore help with questions then feel free to ask me :D</span>
4 0
3 years ago
Can someone please help me with these questions!!!!
IgorLugansk [536]

Answer: B

Step-by-step explanation:

The only labeled angle is 111

We can conclude that angle 3 is also 111

1 and 2 are both less than 90

Therefore, 1 is 69, 2 is 69, and 3 is 111

5 0
3 years ago
Other questions:
  • A clock has a face with a radius of 11.5 centimeters. What is the approximate circumference of the clock?
    13·2 answers
  • Evaluate f(4) =6(4)+5<br> X=4<br><br><br><br><br> Need answers ASAP
    5·1 answer
  • A soft drink machine outputs a mean of 27 ounces per cup. The machine's output is normally distributed with a standard deviation
    8·1 answer
  • What equation does the model represent
    6·1 answer
  • 1. Which equation is equivalent to the equation 6x + 9 = 12?
    8·2 answers
  • HELP me please I'm stuck!!?.​
    14·2 answers
  • !!!What is the range of the data shown below!!!
    6·1 answer
  • Write the inequality in words 1/3n-10&gt;22​
    6·2 answers
  • Solve (x + 4)2 – 3(x + 4) – 3 = 0 using substitution. u = x + 4 Select the solution(s) of the original equation.
    6·1 answer
  • Help? I really need it
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!