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
kodGreya [7K]
3 years ago
5

Solve the simultaneous equations 3x + 2y = 30 3x - y = 21

Mathematics
1 answer:
Mrac [35]3 years ago
3 0

Answer:

x = 8 , y = 3

Step-by-step explanation:

3x + 2y = 30

3x - y = 21      -> y = 3x - 21

3x + 2 (3x - 21) = 30

3x + 6x - 42 = 30

3x + 6x = 30 + 42

9x = 72

x = 72/9 = 8

y = 3*8 - 21 = 24 - 21 = 3

∴ x = 8 & y = 3

You might be interested in
What is n+ -741 = -542 and the explaination? Thanks!
Aliun [14]
N=199 because in order to get a a smaller negative you would have to add a positive into a negative
6 0
3 years ago
Read 2 more answers
Line AB contains points A (3, −2) and B (1, 8). The slope of line AB is −5 negative 1 over 5 1 over 5 5
pentagon [3]
Slope = (8+2)/(1 - 3) = 10/-2 = -5
answer
<span> −5 </span>
8 0
3 years ago
Read 2 more answers
Carl is raising money for his football team. He is selling chocolate bars for $1.50 each and cookies for $2. He sold all 20 of h
stich3 [128]

Answer:

Carl has to sell at least 8 cookies.

c\geq 7.5

Step-by-step explanation:

Carl gets \$1.50 by selling 1 chocolate bar.

Earning from chocolate bars:

Total\ chocolate\ bar=20\\\\Earning\ from\ one\ chocolate\ bar=\$1.50\\\\Total\ earning\ from\ chocolate\ bar=Total\ chocolate\ bar\times cost\ of\ 1\ chocolate\ bar=20\times 1.5=\$30

Earning From cookies:

Let\ total\ number\ of\ cookies=c\\\\Cost\ of\ 1\ cookie=\$2\\\\Earning\ from\ cookies=2\times c=2c

Total\ earning=Earning\ from\ cookies+Earning\ from\ cookies+Earning\ from\ chocolate\ bars\\\\Total\ earning=30+2c

Carl wants to raise at least \$55

Total\ earning\geq 55\\\\2c+30\geq 55\\\\2c\geq 55-30\\\\2c\geq 15\\\\c\geq7.5

7 0
3 years ago
To convert temperatures from degrees Celsius to degrees Fahrenheit, you can use the function F(x)=95x+32 where x is the temperat
iogann1982 [59]

9514 1404 393

Answer:

  F(x) = (9/5)x -459.67

Step-by-step explanation:

F(C(x)) = 9/5(x -273.15) +32

F(C(x)) = (9/5)x -459.67 . . . . . simplify

5 0
2 years ago
Factor 24t–18. <br> Write your answer as a product with a whole number greater than 1.
Natalija [7]
The awnser is 6(4t-3) I hope this helps u
5 0
3 years ago
Read 2 more answers
Other questions:
  • An arc in a circle with a radius of 4 inches is subtended by a central angle that measures 110°. Explain how to find the arc len
    14·2 answers
  • Triangle ABC is similar to Triangle DEF. What is the measure of angle DEF? Refer to image, please show work :)
    15·1 answer
  • Over the weekend, Brady and Jack drove to Key West to go scuba diving. Novw they're preparing to go home. Brady needs gas for hi
    8·1 answer
  • The sales team at an electronics store sold 48 computers last month. The manager at the store wants to encourage the sales team
    11·1 answer
  • The four diagonals of a cube are drawn to create 6 square pyramids with the same base and height. The volume of the cube is (b)(
    12·1 answer
  • Find the sixth term of the geometric sequence 5, -15, 45, ...
    8·1 answer
  • If a circle has a diameter of 21 inches, what is the circumference? (Use 22/7 for π.)
    8·2 answers
  • 2
    11·1 answer
  • IM MARKING BRAINLIEST
    9·1 answer
  • The formula for the density of an object is d = my, where m is the mass and V is the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!