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
nevsk [136]
3 years ago
15

Solve the simultaneous equations -x + 4y = 12 x + y = - 7

Mathematics
1 answer:
blondinia [14]3 years ago
7 0

Answer:

y = 1, x = - 8

or

(-8, 1)

Step-by-step explanation:

-x + 4y = 12

x + y = -7

add the equations together

0x + 5y = 5

5y = 5

y = 1

substitute y for 1 in one of the original equations to find x

x + y = -7

x + 1 = -7

x + 1 - 1 = - 7 - 1

x = - 7 - 1

x = -8

You might be interested in
What is the value of 3x+3y?
NNADVOKAT [17]

Answer:

3(x+y)

Step-by-step explanation

this is the right answer

7 0
3 years ago
Please solve for x and is it complementary or supplementary
Viktor [21]
The answer is 10 x and i think complementary but i could be wrong so you may want someone else to answer that
5 0
3 years ago
Please help! Only answer if you know how to do it.
Mashutka [201]
Your answer would 699.3 that is it
7 0
3 years ago
Need help with a math question
irina1246 [14]

Answer: 27

Step-by-step explanation:

No. Of juniors: 8

Total students: 30

8/30 x 100 = 26.66

Rounds to (whole percent): 27

6 0
3 years ago
Read 2 more answers
Kendra washes windows in an office building. She washes 2/5 of the windows on Monday. She washes 1/3 of the windows on Tuesday.
Svet_ta [14]
First, u find conman denominator which is 15 so 2/5=6/15 & 1/3=5/15, which adds up to 11/15, so the remaining fraction that kendrs has to wash is 4/15
8 0
3 years ago
Read 2 more answers
Other questions:
  • The number -4 is 7 more than an unknown number x find the unknown number x
    7·1 answer
  • The width of a rectangle is 7/15 of its length and the width of the rectangle is 56 cm find the length of the rectangle
    10·1 answer
  • A home pregnancy test is not always accurate. suppose the probability that the test indicates that a woman is pregnant when she
    9·1 answer
  • Find the x-intercepts for the parabola defined by this equation: y=-3x^2-6x+9
    7·1 answer
  • En la escuela Francisco I. Madero de ciudad Delicias, llevaron a cabo el festejo para
    9·1 answer
  • How many thousands = 4,000 ones
    8·1 answer
  • Greta is trying to determine the portion of green candies in various bags of green and yellow candies. Using the information bel
    12·1 answer
  • Find the sum of the geometric series 3+12+48+...+12,288
    5·2 answers
  • 3. the quotient of -9 and y
    11·1 answer
  • Please answer quickly, simple geometry
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!