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
dexar [7]
3 years ago
10

Substitute -4×+y=6 , -5×-y=21

Mathematics
1 answer:
Talja [164]3 years ago
5 0

Answer:

(x, y) = (- 3, - 6)

Step-by-step explanation:

given the 2 equations

- 4x + y = 6 → (1)

- 5x - y = 21 → (2)

rearrange equation (1) expressing y in terms of x

y = 6 + 4x → (3)

Substitute y = 6 + 4x into equation (2)

- 5x - (6 + 4x) = 21

- 5x - 6 - 4x = 21

- 9x - 6 = 21 ( add 6 to both sides )

- 9x = 27 ( divide both sides by - 9 )

x = - 3

Substitute x = - 3 into (3)

y = 6 - 12 = - 6

solution is (- 3, - 6)


You might be interested in
Help please and show work
Nikolay [14]

Answer:

Step-by-step explanation:the half of 32 is 16 so 16 times 2 =-=

3 0
3 years ago
Find the x-intercept of the line graphed by the equation x - 7y = 7. (0, 14) (7, 0) (14, 0) (0, 7)
Nastasia [14]
X-7y=7
To find the x-intercept, substitute y=0
x-7×0=7
x-0=7
x=7
∴ the x-intercept of the line is (7,0)
7 0
3 years ago
PLEASE HELP IF YOU CAN! IM DESPERATE! DUE TODAY!
sukhopar [10]

Answer:

2x+6=-8(x>=-7), 2x+3<9(x<3), 2x-4<=-8(x<=-2), -x-8>=-5(x<=-3), x+-4<=-3(x<=1)

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
The average of 3,5,10 and X is 6, what is the value of X?
Rashid [163]
x = 6
The average of 4 numbers is 6, which means that (3 + 5 + 10 + x) all divided by 4 is 6. That means that 3 + 5 + 10 + x = 24, because 24/4 is 6.

18 + x = 24, subtract 18 from 24 to get x = 6.
6 0
3 years ago
Draw an example of a composite figure that has a volume between 750 and 900 cubic units
agasfer [191]
A rectangle that is 10 wide and 10 high and 8 units long would have 800 cubic units
7 0
3 years ago
Read 2 more answers
Other questions:
  • Which number line models this expression? -2+2
    6·1 answer
  • Can 2 Yards And 60 Inches Be Expressed as a ratio. If Yes, Express In Simplest Form .
    15·2 answers
  • What is the slope of the line shown in the graph? A coordinate plane is shown. Points are graphed at negative 3 comma 2 and nega
    9·2 answers
  • The slope of a line passing through (-9, 10) and (-9, -9) is...
    9·2 answers
  • What is a binomial? followed with an example?
    10·2 answers
  • Find the product.<br> ( x+ 7)^2=x^2
    10·2 answers
  • What are the x- and y-intercepts of the graph of -7x + 4y = -14
    15·1 answer
  • Give an example for a monomial, binomial and trinomial ​
    14·1 answer
  • How many Hostel rooms have 11 or fewer guest
    5·2 answers
  • 2 5 44 3 1 25 2 7 0 ;0 2 6 04 0 2 92 4 0 3AB−− −
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!