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
pochemuha
3 years ago
10

I need to solve these two equations using either substitution or elimination

Mathematics
1 answer:
vitfil [10]3 years ago
8 0

Answer:

y = -15

x = -10

Step-by-step explanation:

1/4x - 1/2 = 5 (1)

3x + 2/3y = -40 (2)

Multiply (1) by 4

1/4x - 1/2 = 5

1/4x * 4 - 1/2y * 4 = 5 * 4

4/4x - 4/2y = 20

x - 2y = 20 (3)

Multiply (2) by 3

3x + 2/3y = -40 (2)

3x * 3 + 2/3y * 3 = -40 * 3

9x + 6/3y = -120

9x + 2y = -120 (4)

x - 2y = 20 (3)

9x + 2y = -120 (4)

Using elimination method, Add (3) and (4)

9x + x = -120 + 20

10x = -100

x = -100/10

x = -10

Substitute x = -10 into (3)

x - 2y = 20 (3)

-10 - 2y = 20

-2y = 20 + 10

-2y = 30

y = 30/-2

y = -15

y = -15

x = -10

You might be interested in
Write an inequality for the following graph
Tom [10]

Answer:

I am pretty sure it would be B.

7 0
2 years ago
Read 2 more answers
Evaluate the expression 7x to the power of 2y, when x = 5 and y = 3.
Stells [14]
The answer is 210 hope this helps
6 0
3 years ago
A scientist finds the distances d that two snakes travel in a time of t seconds. the equation 16t = d represents the relationshi
wlad13 [49]
From the equation given, the time for the black mamba snake to cover distance d, will be d/16 while that for the the rought-scaled snake would be d/1.5.
Assume that the distance covered by both snakes is 200 meters;
Then, 
Time taken by the black mamba is 200/16  = 12.5 seconds, and
Time taken by the rought-scaled snake is 200/1.5 = 133.33 seconds
Clearly the black mamba is faster at 12.5 seconds compared with the rought-scaled snake.
4 0
3 years ago
Which relationship describes angles 1 and 2? Select each correct answer. A adjacent angles B complementary angles C vertical ang
Scrat [10]
The correct answer for this question is this one:
<span>- A adjacent angles
-D supplementary angles

The relationship that describes angle 1 and angle 2 is that they are adjacent angles -- at the same time they are also supplementary angles.</span>
Hope this helps answer your question and have a nice day ahead.
3 0
3 years ago
Read 2 more answers
A baseball player reaches first base 20% of the times he is at bat. Out of 70 times at bat, about how many
leva [86]

Roughly 14 times as 20% of 70 is 14.

4 0
3 years ago
Other questions:
  • What is negative 7 time 9 over 7
    5·2 answers
  • Help pleaseee it’s a quiz<br> 35 points
    8·1 answer
  • What equation has the numbers 7, 5, 6, and 3 and equals 75
    12·1 answer
  • Plzz help will MARK BRAINLIEST
    13·2 answers
  • Jason can mow his parents' yard in 3 hr. His brother can mow it
    11·1 answer
  • Step by step
    14·1 answer
  • At a dog park, there are 10 black dogs, 5 brown dogs, 2 white dogs, and 12 multi-color dogs.
    9·2 answers
  • Helppp plssss helppp I have to hand this in in 7 min so pls help
    5·1 answer
  • A sales associate farms a neighborhood with 750 homes. The owners seem to list their homes every six years. How many listings sh
    8·1 answer
  • the sum of two numbers is 123. when the larger number is added to 5 times the smaller, the sum is 343. find the numbers.​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!