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
Natalka [10]
2 years ago
9

-3x + 4y = -15 and 4x - y = -19

Mathematics
2 answers:
natali 33 [55]2 years ago
4 0

Answer:

x=-7, y=-9. (-7, -9).

Step-by-step explanation:

-3x+4y=-15

4x-y=-19

---------------

y=4x-(-19)

y=4x+19

-3x+4(4x+19)=-15

-3x+16x+76=-15

13x=-15-76

13x=-91

x=-91/13

x=-7

4(-7)-y=-19

-28-y=-19

y=-28-(-19)

y=-28+19

y=-9

Eduardwww [97]2 years ago
3 0

Answer:

\boxed{\sf x=-7}

\boxed{\sf y=-9}

Step-by-step explanation:

Solve for y → 4x - y = -19

\sf y=19+4x

Subtract 4x from both sides:

\sf -y=-19-4x

Multiply both sides by -1:

\sf y=19+4x

Now, Substitute y=19+4x to - 3x+4y= -15:

Let y=9+4x

\sf -3x+4(19+4x)=-15

\sf 13x+76=-15

Solve for x → 13x+76=-15

Subtract 76 from both sides:

\sf 13x=-15-76

\sf 13x=-91

Divide both sides by 13:

\sf \cfrac{13x}{13} =\cfrac{91}{15}

\boxed{\sf x=-7}

Substitute x= -7 into y=19+4x:

\sf y=19+4x

Let x= -7

\sf y=19+4\times-7

\boxed{\sf y=-9}

_____________________________________

You might be interested in
It asks for the Median. I.R and the range
shutvik [7]

Answer:

Median 69

Interquartile range: 38

Range: 73

4 0
3 years ago
What is 16.437 rounded to the nearest tenth
Hunter-Best [27]
16.4 to nearest tenth
3 0
3 years ago
What's the first step to solve this equation? *<br> h - 18/10 = –14
Lesechka [4]

Answer:

multiply by 10 on both sides

that is to get rid of the denominator

4 0
3 years ago
Someone please help me thank you
german

Answer:

4

Step-by-step explanation:

7x = x² - 8

=> x² - 7x - 8 = 0

use quadratic formula:

a = 1, b = -7, c = -8

x = \frac{-(1)±\sqrt{(-7)^{2} - 4(1)(-8) } }{2(1)} <em>(pls ignore the "A" I don't know why it's showing up)</em>

=> x = \frac{-1±\sqrt{49 + 32} }{2}

=> x = \frac{-1±9 }{2}

=> x = \frac{-1 +9}{2} = 4 or \frac{-1-9}{2} = -5 <em>(the answer is only 4 since it's asking for the positive solution)</em>

6 0
3 years ago
Read 2 more answers
First one please thanksssa
serious [3.7K]

In order to find this, we need to count exactly how many times each of them blinks within 60 seconds. Then, we find which numbers are the same.

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60

6, 12, 18, 24, 30, 36, 42, 48, 54, 60

Now, I will bold the numbers that are the same.

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60

6, 12, 18, 24, 30, 36, 42, 48, 54, 60

Now, we have our answer.

Answer: The two neon lights will blink on the 12, 24, 36, 48, and 60 second marks.

Hope I helped!

5 0
3 years ago
Other questions:
  • What is the slope of the line that passes through the points (-3,2),(8,-9)
    10·2 answers
  • I need help with this now please
    10·2 answers
  • HELP!!!!!!
    12·1 answer
  • 4/9 times 19 please help its for an exam!!! ive tried
    13·1 answer
  • Hey can someone help me real quick with this question
    9·1 answer
  • Paul is comparing the cost of cell phone services. At CellCoA, the phone he wants costs $305 and the unlimited calling plan cost
    6·1 answer
  • On Tuesday, the temperature in Fairfield, Montana fell from 51 degrees Fahrenheit at noon to -9 degrees. Fahrenheit at midnight.
    14·1 answer
  • Simplify (sin? 0 + cos² O) (sin 0 + cos O)
    12·2 answers
  • Please solve this now. Everything is attached in the file. You need to provide a full solution. Thanks
    15·1 answer
  • The orange shape is a dilation of the black shape. The scale factor is _____.(This is a practice quiz!)
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!