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
Alpha false and true Which of the following statements are true? If false, explain briefly.
solmaris [256]

Answer:

A. False

B. True

C. True

D.True

Step-by-step explanation:

A. False . The significance level or alpha is the probability of rejecting the null hypothesis when it is true. For example, a significance level of 0.05 indicates a 5% risk of concluding that a difference exists when there is no actual difference. 0.01 alpha is better than 0.05 alpha . 0.01 indicate a 1% risk of rejecting the null hypothesis when it is true .

B. True . If the p-value is less than alpha, we reject the null hypothesis . Therefore statistically significant.

C . True . If the p-value is less than alpha, we reject the null hypothesis

D. True . Alpha will be greater than p-value . Therefore we will reject .

8 0
3 years ago
Please help me guys I beg you I will give you lots of credit plz
IRINA_888 [86]

Answer:

11m/min

Step-by-step explanation:

slope of the line = velocity of the turtle

slope = y/x

= 55/5

=11

4 0
3 years ago
Read 2 more answers
A plane can fly 7 miles per minute. The plane will fly 8 trips, and each trip is 810 miles. How many hours will the plane fly? S
ELEN [110]

7*60 = 420

 810/420 = 1.9285

93- 100 = 53-60

subtract 40 from 93. 

1.53*8 = 12.24

Answer: 12 hours and 24 Minutes

If this helps give a brainliest :)

4 0
3 years ago
I need help solving these problems please.
ddd [48]

5. 15 x 3/4 = 11.25

6. 10 x 1/2 = 5

7.  11 x 2 = 22

8. 12/1.5 = 8

5 0
3 years ago
A bag contains 12 beads 2 blue 1 green 3 purple the rest red
Anestetic [448]
Answer : 6 red beads

explanation: 2+1+3 = 6

12-6 = 6

hope this helps :)
3 0
3 years ago
Other questions:
  • A quadrilateral with vertices at A(4, –4), B(4, –16), C(12, –16), and D(12, –4) has been dilated with a center at the origin. Th
    5·2 answers
  • If D is the midpoint of the segment AC and C is the midpoint of segment DB , what is the length of the segment AB , if AC = 3 cm
    13·2 answers
  • Which variable is discrete
    6·1 answer
  • Estimate 24% of 33.<br><br> a) 17<br><br> b) 12<br><br> c) 8<br><br> d) 2
    8·1 answer
  • What is an equation of a line that has a slope of -1/2 and a y-intercept of 4
    11·2 answers
  • Solve the equation (linear equation)<br><br> <img src="https://tex.z-dn.net/?f=%28%5Cfrac%7B16%7D%7B9%7D%29%20%5E%7B2x%20%2B5%7D
    5·1 answer
  • Which measure is equivalent to 18,000 s?
    13·2 answers
  • Exactly how do you figure out one step equations? We're learning about these in math now, and it's very difficult for me.
    11·1 answer
  • Brad swims 4 laps every 6min how long does it take him to swim 14 laps?
    8·1 answer
  • Solve for x and round to nearest tenth &lt;3
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!