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
ahrayia [7]
2 years ago
14

{2x + y = -1} {3x- 5y + -21}

Mathematics
2 answers:
NARA [144]2 years ago
8 0

Answer:

your question is not complete or should I say not correct ☺️

SVEN [57.7K]2 years ago
6 0

Answer:

(-2, 3).

Step-by-step explanation:

2x + y = -1

3x- 5y = -21

Multiply the first equation by 5:

10x + 5y = -5     Adding this to the second equation:

13x = -26

x = -2.

Substituting this into equation 1:

2(-2) + y = -1

y = -1 + 4 = 3.

Checking this result in the second equation:

3(-2) - 5(3)

= -5 - 15 = -21

- Checks OK.

You might be interested in
Avoiding an accident while driving can depend on reaction time. Suppose that reaction time, measured from the time the driver fi
Nadya [2.5K]

Answer:

2.5% of drivers have a reaction time more than 2.14 seconds

16% of drivers have a reaction time less than 1.78 seconds

84% of drivers have a reaction time less than 2.02 seconds

Step-by-step explanation:

The Empirical Rule(68-95-99.7 rule) states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

The normal distribution is symmetric, which means that 50% of the measures are below the mean and 50% are above.

In this problem, we have that:

Mean = 1.9s

Standard deviation = 0.12

What percentage of drivers have a reaction time more than 2.14 seconds?

2.14 = 1.9 + 2*0.12

So 2.14 is two standard deviations above the mean.

Of the 50% of the measures above the mean, 95% are within 2 standard deviations of the mean, so, below 2.14. The other 5% is above.

0.05*0.5 = 0.025

2.5% of drivers have a reaction time more than 2.14 seconds

What percentage of drivers have a reaction time less than 1.78 seconds?

1.78 = 1.9 - 0.12

So 1.78 is one standard deviation below the mean.

Of the 50% of the measures that are below the mean, 68% are within one standard deviation of the mean, that is, greater than 1.78.

100 - 68 = 32

0.32*50 = 0.16

16% of drivers have a reaction time less than 1.78 seconds

What percentage of drivers have a reaction time less than 2.02 seconds?

2.02 = 1.9 + 0.12

So 2.02 is one standard deviation above the mean.

Of the measures that are below the mean, all are below 2.02.

Of those that are above, 68% are below 2.02.

0.5 + 0.68*0.5 = 0.84

84% of drivers have a reaction time less than 2.02 seconds

5 0
3 years ago
Write an equation of a line parallel to the line y=2x+7 and passing through the point (4,2)
trasher [3.6K]
Y=mx+b
lines are parallels so m=2

y=2x+b
 line passing through the point (4,2), so x=4 y=2
put these value in equation
2=2*4+b
2=8+b
b=2-8
b=-6
y=2x-6
Answer: y=2x-6

(verification on the picture)

4 0
3 years ago
Read 2 more answers
What does k and y equal?
Kaylis [27]
X and y vary directily means

y=kx

72=3k
divide both sides by 3
24=k

k=24
y=72
8 0
2 years ago
A restaurant bill is $25 and a 20 percent tip should be given to the waiter.Which expression can be used to find the total amoun
charle [14.2K]
25(0.2)+25 multiply 25 by 0.2 to find 20% of $25 then add that to the bill of $25
5 0
3 years ago
Which number is in the solution set of the inequality x &gt; -4<br><br> -2<br> -6<br> -8<br> -10
Alik [6]

Answer:

-2

Step-by-step explanation:

The inequality is x is greater than -4.

-6, -8, and -10 are all less than -4.

-2 is the only one greater than.

6 0
2 years ago
Read 2 more answers
Other questions:
  • Mrs. Reyes asked 3 girls and 4 boys to help with a project. She had each student make 8 paper airplanes. ​
    8·1 answer
  • Rewrite each pair of unlike fractions as like fractions 1/2,1/4
    15·1 answer
  • What is tm2×2<br>&amp;hhrhejejrh​
    8·1 answer
  • Someone help me with this
    13·2 answers
  • 52% of what number equals 39
    8·2 answers
  • Two cards are drawn without replacement from a standard deck of 52 cards. What is the probability that one of the cards is red a
    10·1 answer
  • Which of the following equations could you solve by first adding six and then dividing by negative three?
    9·2 answers
  • Sally can paint a room in 9 hours while it takes Steve 3 hours to paint the same room. How long would it take them to paint the
    5·2 answers
  • What is the slope of the line represented by the equation y=- } - 5x?
    6·2 answers
  • JAB Consulting received a promissory note of $13,500 at 7% simple interest for 15 months from one of its customers. After 6 mont
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!