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
Kaylis [27]
4 years ago
12

Solving linear system, substitution 20x-30y=-50 x+2y=1 HELP PLEASE

Mathematics
1 answer:
hjlf4 years ago
6 0
20x -  30y = -50 ⇒ 20x -  30y = -50
    x +   2y = -1   ⇒ <u>20x + 40y = -20</u>
                                       <u>-70y</u> = <u>-30</u>
                                        -70     -70
                                            y = ³/₇
                           20x - 30(³/₇) = -50
                             20x - 12⁶/₇ = -50
                             <u>      + 12⁶/₇  + 12⁶/₇
</u>                                        <u>20x</u> = <u>47¹/₇
</u>                                         20<u />       20<u>
</u>                                            x = 2⁷/₂₀
                                      (x, y) = (2⁷/₂₀, ³/₇)
You might be interested in
4 (negative one-half x + 7) + 5 x = 15
Ronch [10]

Answer:

Step 3 is incorrect

Step-by-step explanation:

4(-1/2x + 7) + 5x = 15

-2x + 28 + 5x = 15

3x + 28 = 15

3x + 28 - 28 = 15 - 28

3x = -13

4 0
3 years ago
Simplify, THEN evaluate for x = 3, y = -4, and z= -2.<br> 7(x - y) - 3(2 + 2x)
Tamiku [17]

Answer:  25

<u>Step-by-step explanation:</u>

   7(x - y) - 3(2 + 2x)

= 7x - 7y  - 6  - 6x

=   x - 7y  - 6

for x = 3, y = -4

      3 - 7(-4) - 6

=     3 + 28  - 6

=         31     - 6

=             25

8 0
3 years ago
8 times ( 18 divides 6 )
Vika [28.1K]

Answer: 24

Step-by-step explanation: 8x3=24 in which 18 divided by 6 is 3.

6 0
3 years ago
Read 2 more answers
A sixth's grader class had 12 boys and 24 girls. Write two more statements comparing the number of boys in class to the number o
ahrayia [7]
The ratio of boys to girls is
12:24
(which is already one statement)
the ratio, simplified, is
1:2
(ratio are like fractions, which is how I was able to "simplify" it)
7 0
3 years ago
Read 2 more answers
Area of circle
Gre4nikov [31]

Answer:

1. area

2. circle

3. equilateral

4. length

5. perimeter

6. polygon

7. regular polygon

8. trapezoid

9. legs

10. area of a circle

11. hexagon

12. octagon

13. inscribed polygon

14. apothem

15. composite figure

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Are 7 and 42 relatively prime
    8·1 answer
  • A bag of fruit contains 3 apples and 2 oranges and 1 banana and 4 pears.Gerald will randomly selected two pieces of fruit one at
    14·1 answer
  • Solve the following equations then place the correct number in the box provided.
    13·1 answer
  • Company A can produce 100 CPUs in 3 days while Company B can produce 150 CPUs in 4 days. If the two companies join forces, how m
    14·2 answers
  • 2y = 1/4<br><br> find the value of y
    15·2 answers
  • Joey is building a frame for a sandbox. The sandbox is going be have the shape and dimensions below. If the diagonal of the sand
    7·1 answer
  • . Explain the Error: Katie said, “All Negative numbers are integers.” What was her error?
    5·2 answers
  • LOTS OF POINTS WILL GIVE BRAINLIEST IF ANSWERED CORRECTLEY PLZ HELP
    11·2 answers
  • Aurora is planning to participate in an event at her school's field day that requires her to complete tasks at various stations
    15·2 answers
  • HELPP MEEEEEEEEEEEEEE thanks <br> no fake answers please will mark the brain list if correct.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!