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
mart [117]
3 years ago
11

2x-y and 7y= -7 +3x solve by substitution

Mathematics
1 answer:
miss Akunina [59]3 years ago
7 0

Answer:

x = -7/11, y = -14/11

Step-by-step explanation:

2x = y ------- (1)

7y = -7+3x -------- (2)

from (1)

2x = y

y = 2x ------- (3)

substitute (3) into (2)

7y = -7+3x

7(2x) = -7+3x

14x = -7+3x

14x-3x = -7

11x = -7

x = -7/11

substitute x = -7/11 into (3)

y = 2x

y = 2(-7/11)

y = -14/11

x = -7/11, y = -14/11

You might be interested in
4 consecutive odd integers add up to -200. Find the integers.
Alexeev081 [22]
Let
x = first odd integer
x + 2 = second odd integer
x + 4 = third odd integer
x + 6 = fourth odd integer

x + (x + 2) + (x + 4) + (x + 6) = -200
4x = -200 - 2 - 4 - 6
4x = -212
x = -53

Therefore, the four consecutive integers are -53, -51, -49, -47.
4 0
3 years ago
PLEASE HELP I’LL PROMISE TO GIVE BRAINLESSNESS
ycow [4]

Answer:

a) If the diameter is 400 feet wide, then the radius is half that, which is 200 feet wide.

b) The circumfernce is π times the diameter, which is 400 feet. 400×π≈1256.64

c) She is not correct. She squared 400, which is 160000, when she should have squared 200, which is 40000. Then, multiply by π.

40000 × π ≈ 125663.7

7 0
3 years ago
45/6 simplify into a mixed number
almond37 [142]

Answer:

7 3/6

Step-by-step explanation:

45/6=7 ---- finding what it is divisable by

7*6=42

45-42=3 ----- finding the remainder

7 0
3 years ago
Read 2 more answers
Can anyone answer this for me please and explain I really don’t understand it I’ll mark you brainliest
Elodia [21]

Answer:

I really don't know

6 0
3 years ago
Read 2 more answers
How many kilograms is a mass of a cat and show your work
MA_775_DIABLO [31]
1000 grams = 1 kilograms.....

the average mass of cat is 5000 grams, so if you convert this into KG then the answer would be 5 kg because if 1000*5 = 5000 which equals to 5 kg.....hope this helps :)
4 0
3 years ago
Read 2 more answers
Other questions:
  • Luis found a new text messaging plan which will charge him $2.00 for 80 messages. Using this plan, how much would he pay for 900
    9·1 answer
  • Find (f ∘ g)(4) when f(x) = -5x - 7 and g(x) = -6x 2 + 9x + 9.
    5·1 answer
  • Find 3 consecutive even integers such that 5 times the second is 82 more than the first .
    13·1 answer
  • Julie and Mona know that that Earth’s average distance from the Sun is approximately 93 million miles and it takes 1 year to com
    13·1 answer
  • What is the value of f(x)=2/3x + 4 when x = 9
    5·1 answer
  • Simplify x2 + 10x + 9 over 2(x + 9) − (x + 9)
    12·1 answer
  • I need help with this and I’m new pls be nice to me pls
    7·1 answer
  • 3. Multiply: (x + 8)(x - 12)<br><br> Please show work
    14·2 answers
  • Solve for xxxx plsss​
    13·1 answer
  • Which is the solution to this system of equations?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!