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wariber [46]
4 years ago
8

Find the sum of 5x+20 and the opposite of 20 then write an equivalent expression on standard form

Mathematics
1 answer:
miss Akunina [59]4 years ago
3 0

Answer:

Step-by-step explanation:

the sum of 5x+20= 5(x+4)

and the opposite of 20 is negtive 20

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Show and explain how replacing one equation by the sum of that equation and a multiple of the other produces a system with the s
My name is Ann [436]
First, let's multiply the first equation by two on the both sides:
<span>8x + 7y = 39         /2
</span>⇒ 16x + 14y = 78

Now, the system is:
<span>16x + 14y = 78
</span><span>4x – 14y = –68
</span>
After adding this up in the column:
(16x + 4x) + (14y - 14y) = 78 - 68
20x = 10
⇒ x = 10/20 = 1/2


y can be calculated by replacin the x:
<span>8x + 7y = 39
</span>⇒ 8 · 1/2 + 7y = 39
4 + 7y = 39
7y = 39 - 4
7y = 35
⇒ y = 35 ÷ 7 = 5
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4 years ago
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Which term can be added to the list so that the greatest common factor of the 3 terms is 12h3
sashaice [31]
The term that can be added to the list so the GCF is 12h3 would be 48h5. 
The reason being is that 48 is first divisible by 12 and does not yield a fraction, and we can remove upon dividing 3 h's from this term as it contains a total of 5 h's.
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4 years ago
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Mrrafil [7]

Answer:

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Step-by-step explanation:

It is congruent to the other side.

5 0
3 years ago
Can any help me with this question
Y_Kistochka [10]
Ok...there are 6 days in the week that end in a y: Monday, Wednesday, Thursday, Friday, Saturday, Sunday.
Saturday is one out of the 6, so it's 1/6....If they want it as a percent, then divide 1 by 6, and multiply it by 100.

Hope I helped!
4 0
3 years ago
(9/89)x490+324<br> Please help
Likurg_2 [28]

Answer:

  1. (9/89)×490+324=
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3 years ago
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