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Darina [25.2K]
3 years ago
5

Will mark brainliest:) helppppp -7x + y = -19 -2x+ 3y = -19 solve the system of equations

Mathematics
1 answer:
Luba_88 [7]3 years ago
7 0

Answer:

X=2, Y=-15

Step-by-step explanation:

-7x+y=-19

-2x+3y=-19

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

-3(-7x+y)=-19

   -2x+3y=-19

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

21x-3y=57

-2x+3y=-19

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

19x     = 38

19x/19=38/19

x=2

now plug 2 into x of the second equation to get y=-15

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Amiraneli [1.4K]
2 2/5 per day I’m pretty sure ( 3 1/8 / 7 1/2)
8 0
4 years ago
Read 2 more answers
What is the vertex of the parabola y=2x2+20x-15?<br><br> (5, 135)<br> (-5, -165)<br> (-5, -65)
maria [59]

Answer:

-296=2×2+20×-15that is the answer

Step-by-step explanation:

you need to calculate the equation step by step to get to the answer

5 0
3 years ago
The ages (in years) of the 6 employees at a particular computer store are 44, 46, 40, 34, 29, 41
son4ous [18]
step 1
<span>compute the average: add the values and divide by 6
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step 2
</span><span>Compute the deviations from the average
dev: (44-39)=5,
</span>dev: (46-39)=7
dev: (40-39)=1
dev: (34-39)=-5
dev: (29-39)=-10
dev: (41-39)=2

step 3
<span>Square the deviations and add
sum (dev^2): 5^2+7^2+1</span>^2+-5^2+-10^2+2^2
sum (dev^2): 25+49+1+25+100+4-----> 204

step 4
<span>Divide step #3 by the sample size=6
(typically you divide by sample size-1 to get the sample standard deviation,
 but you are assuming the 6 values are the population,
so
no need to subtract 1, from the sample size.
This result is the variance
Variance =204/6=34

step 5
</span><span>Standard deviation = sqrt(variance)
standard deviation= </span>√<span>(34)------> 5.83

the answer is
5.83</span>


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3 years ago
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Mkey [24]
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3 years ago
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