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
Vladimir79 [104]
3 years ago
7

Student claims that he can solve 12 X plus 8Y equals 40 and 4X plus 5Y equals 18 for axing why by adding the first equation into

multiple of the second equation he can use the new equation and the first equation to create a new system that has the same solution of the original listing it begins by listing for different equations determine whether the student can use the credit to replace the second equation and create a new system that has the same solution select yes or no for each equation
Mathematics
1 answer:
Svetllana [295]3 years ago
4 0

Answer:

x = 2 and y = 2

Step-by-step explanation:

The given system of equations are :

12x+8y = 40 ...(1)

4x+5y = 18  ....(2)

Multiply equation (2) by 3.

12x+15y = 54 ...(3)

Subtract equation (1) by (3).

12x+15y-(12x+8y) = 54-40

12x+15y-12x-8y = 14

7y = 14

y = 2

Put the value of y in equation (2).

4x+5(2) = 18

4x+10 = 18

4x = 8

x = 2

The solutions of the given equations are x = 2 and y = 2

You might be interested in
A TV station has 11 minutes of commercials for each 60 minutes of air time. What percent
Julli [10]

Answer: Approximately 18.33%

Work Shown:

11/60 = 0.1833 approximately

This decimal converts to 18.33% when moving the decimal point over to the right two spots. Round this value however you need to.

5 0
3 years ago
If f(x)=7x, which of the following is the inverse of f(x)?
8090 [49]
The inverse is f¯¹(x)=x/7.
3 0
3 years ago
Read 2 more answers
Help??I have 4 questions and im confused on all of them
KengaRu [80]
So you you are trying to find the area of sphere so you would use this formula
A=4•3.14•r^2

And you already know that the radius is 6 so you would go ahead and plug in the numbers
A=4•3.14•4^2

4^2 is 16 so your final equation would be
A=4•3.14•16

And your answer is

=452.39
4 0
3 years ago
Simplify 10^–8. <br> 1/-100000000 <br> 1/100000000 <br> 1/-80 <br> 1/80
cluponka [151]

Answer:

C

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Pls help me with this multiple choice !
lana66690 [7]

Answer:

D

Step-by-step explanation:

\sin(60)  =  \frac{6 \sqrt{3} }{x}  \\ x =  \frac{6 \sqrt{3} }{ \sin(60) }  = 12 \\  \tan(60)  =  \frac{6 \sqrt{3} }{y}   \\ y =  \frac{6 \sqrt{3} }{ \tan(60) }  =   6

8 0
2 years ago
Other questions:
  • * What is the sum? Complete the equation.<br> –5.3+(-4.1) =
    14·2 answers
  • My brother wants to estimate the proportion of Canadians who own their house.What sample size should be obtained if he wants the
    10·1 answer
  • Divide 180 in a ratio of 4:5:9
    11·1 answer
  • What are the angles in a 30˚- 60˚- 90˚ triangle after it is rotated 45˚?
    10·1 answer
  • Ab-.5b when a= 1 and b= 5
    13·1 answer
  • I need help pls help me!!!!
    6·1 answer
  • Can someone please help me!!!!!!
    8·1 answer
  • Find a real number between -√9 and √25.<br> a.-4<br> b.1<br> c.-5<br> d.6
    5·2 answers
  • What is 14/27 divided 7
    12·2 answers
  • How many times greater is 3.9*10^-4 than 7.8 10^-6
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!