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
AlladinOne [14]
2 years ago
13

SOLVE ALL THESE EQUATION BY USING THE METHOD SUBSTITUTION ALGEBRAICALLY HERE'S ARE ALL THE EQUATION:

Mathematics
1 answer:
pav-90 [236]2 years ago
3 0

Answer:

See below ~

Step-by-step explanation:

<u>Question 1</u>

  • -7x - y = -1
  • y = 8x + 16

⇒ -7x - (8x + 16) = -1

⇒ -7x - 8x - 16 = -1

⇒ -15x = 15

⇒ x = -1

⇒ y = 8(-1) + 16 = 8

⇒ Solution = <u>(-1, 8)</u>

<u></u>

<u>Question 2</u>

  • 3x + 4y = 0
  • y = -3x - 18

⇒ 3x + 4(-3x - 18) = 0

⇒ 3x - 12x - 72 = 0

⇒ -9x = 72

⇒ x = -8

⇒ y = -3(-8) - 18 = 6

⇒ Solution = <u>(-8, 6)</u>

<u>Question 3</u> (not clear)

<u>Question 4</u>

  • -8x - 7y = 0
  • y = 6x

⇒ -8x - 7(6x) = 0

⇒ -8x - 42x = 0

⇒ -50x = 0

⇒ x = 0

⇒ y = 6(0) = 0

⇒ Solution = <u>(0, 0)</u>

<u>Question 8</u>

  • 2x - 6y = -14
  • y = -5x - 19

⇒ 2x - 6(-5x - 19) = -14

⇒ 2x + 30x + 114 = -14

⇒ 32x = -128

⇒ x = -4

⇒ y = -5(-4) - 19 = 1

⇒ Solution = <u>(-4, 1)</u>

You might be interested in
Work out length of side b<br>give your answer to 1 decimal place<br><br>plzzzz hhheellpp​
Vedmedyk [2.9K]

√b = 17.17 - 12.12

√b= 289 - 144

√b= 145

b= √145

3 0
3 years ago
Read 2 more answers
5 ) ( 8 x 10 - 82 ) - 8​
juin [17]

Answer:

16

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Is (4, 7) a solution to the system of equations? Explain your answer.
Angelina_Jolie [31]

Answer:

No

Step-by-step explanation:

Neither 4 or 7 is a solution to both equations

4 0
3 years ago
Please hurry it almost due
kolezko [41]

Answer: -18 - -18

Step-by-step explanation: Aka negative eighteen minus negative eighteen

5 0
3 years ago
Someone help me on this plz
Elodia [21]
The answer is .29 if you didn't know yet..
5 0
3 years ago
Read 2 more answers
Other questions:
  • HELP ME PLEASE I BEG YOU!!!
    10·1 answer
  • Javine divided the two polynomial shown what is the quotient
    10·1 answer
  • Which of the following are equal to O(7) O(n)=2n-1
    9·1 answer
  • Please explain how to do this, I'm using all my points<br><br>A. 40 L<br>B. 80 L<br>C. 4 L <br>D. 8L
    6·1 answer
  • "A corn refining company produces corn gluten cattle feed at a variable cost of $82, per ton. If fixed costs are $120,000 per mo
    11·1 answer
  • Angel buys a 12-pack of granola bars for $9. What is the unit price? $1.33 $0.75 $1.20 $0.80
    10·1 answer
  • Can someone please explain it please: The jones family paid £1890 for their holiday with shark tours after a 12.5% surcharge was
    13·1 answer
  • A prize fund is divided between Sean Barry and Cian in the ratio of 4:3:2 if Cian got 1224 what's the total fund?
    6·1 answer
  • Find the slope:<br> (-7, 4), (13, 4)<br> O 20<br> O Zero<br> O Undefined
    9·2 answers
  • Select all the points that are on the line through (0,5) and (2,8).
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!