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Reptile [31]
3 years ago
5

What is the solution to the system of equations? Y=2x-5. -8x-4y= -20

Mathematics
1 answer:
stiv31 [10]3 years ago
5 0
<span>Y=2x-5
 -8x-4y= -20
---------------------------
Substitute 2x-5 for y in </span> -8x-4y= -20
<span>-8x-<span>4<span>(<span>2x-5</span>)</span></span></span>=-<span>20
</span>-16x+20=-<span>20
</span>---------------------------------------
Add -20 on each side
<span>-16x+20+-20</span>=-<span>20+-20
</span>-16x = -40
------------------------------------------------
Divide each side by -16
16x / -16 = -40 / -16
x = 5/2 or 2.5
now we have x
===============================================================
To find Y Substitute 2.5 for X in y=<span><span>2x-</span><span>5
y = 2(2.5)-5
y = 0
---------------------------------------
X = 5/2 or 2.5 and Y = 0</span></span>
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8 0
3 years ago
A standard die is rolled 360 times in hopes of rolling a 5 or 6. So the probability of success is p=1/3. Find the standard devia
lana [24]

Answer: option 1 is the correct answer

Step-by-step explanation:

Number of times for which the die was rolled is 360. It means that our sample size, n is 360.

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The formula for standard deviation is expressed as

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4 0
3 years ago
How many solutions does the system have?
Novay_Z [31]

Answer:

none

Step-by-step explanation:

to solve this equation we would say that

let

x + y = 5 .............................. equation 1

x + y = 6 .................................... equation 2

from equation 2

x + y = 6 .................................... equation 2

x = 6 -y...................................... equation 3

substitute for x into equation 1

x + y = 5 .............................. equation 1

6 - y + y = 5

from here this equation cannot be solved further therefore it has no solution.

6 0
3 years ago
A basket contains 12 apples and some other fruit. Write an equation that could be used to find the total number of fruits in the
o-na [289]
A basket contains 12 apples and some other fruit
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0.40x = 12....with x being the total fruit in the basket <== ur equation
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7 0
3 years ago
Systems of equations by substitution
Korolek [52]
Could you please clarify the question please by putting a question to be solved? Or are you asking for the definition?
6 0
3 years ago
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