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
bonufazy [111]
3 years ago
10

use the elimination method to solve the system of equations. choose the correct ordered pair. 7x+3y=30 -2x+3y=3

Mathematics
1 answer:
andreev551 [17]3 years ago
3 0

Answer:

x = 3, y = 3

Step-by-step explanation:

Elimination method to find x:

  (7x + 3y = 30) * -1      ===>                              -7x - 3y = -30

                                                                          -2x + 3y = 3                    

  add two equations to eliminate y             ______________

                                                                                 -9x = -27     ===>   x = 3

substitution to find y:  

  -2x + 3y = 3

  -2(3) + 3y = 3

  -6 + 3y = 3

  3y = 9

    y = 3

Elimination method to find y:

  (7x + 3y = 30) * 2         ===>                           14x + 6y = 60

  (-2x + 3y = 3)  * 7         ===>                         -14x + 21y = 21

  add two equations to eliminate x             ______________

                                                                              27y = 81      ===>   y = 3

You might be interested in
Last year at a certain high school, there were 125 boys on the honor roll and 80 girls on the honor roll. This year, the number
Elodia [21]

Answer:

6.8% decrease

Step-by-step explanation:

a drop of 8% means that only 92% of 125 boys remained on honor roll from last year; .92 x 125 = 115

a drop of 5% means that only 95% of 80 girls remained on honor roll from last year; .95 x 80 = 76

total number of students on honor roll last year = 125 + 80 = 205

total number of students on honor roll this year = 115 + 76 = 191

percent of change = (191 - 205) ÷ 205 = -14/205 = -.068

-.068, which represents a 6.8% decrease

3 0
2 years ago
What is 2/10 as a percent
Wittaler [7]
2/10 as a percent would be 20%.
5 0
3 years ago
Read 2 more answers
Pls help me and can you give tips on exponents??!
Marina CMI [18]

Answer:

Basically, exponents represent the number of times you multiply that number by itself. For example, 3² = 9, because you multiply 3 times 3.

Step-by-step explanation:

7 0
3 years ago
A submarine was located 800 feet below sea level. There is a drone
fgiga [73]

Answer:

1,050

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Which is greater 10 L or 1000 ML
velikii [3]
I am assuming you mean mL. So milliliters.
Milli is the thousandths.  
1,000 milliliters is 1 liter.
That would mean that 10L is greater than 1,00mL.

Hope this helps!
5 0
4 years ago
Read 2 more answers
Other questions:
  • Find 8 *397 show your work ,explain why this strategy works best with the factors ?
    10·2 answers
  • Find the LCM of 7 and 13
    13·2 answers
  • 20 POINTS PLZ HELP ASAP please show working out only need answer for Z<br> will mark brainliest
    12·2 answers
  • Answer of the question and method how to solve
    14·1 answer
  • A second-hand clothing store makes a profit of $4.50 for every piece of used clothing it sells. If the store manager wants to ma
    7·2 answers
  • 10 x 7 thousands unit form
    14·1 answer
  • Mr. A is 30 years old and Mr. B is 40 years old. Calculate thier year of birth :)​
    5·1 answer
  • Nick planted a cedar tree. It grew 10 cm in ½ of a year. What will the height of the tree be at the end of 6 years?
    13·1 answer
  • Subject
    6·1 answer
  • 20 friends compared the number of text messages they sent in a day. The results are represented in the table below:
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!