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JulijaS [17]
3 years ago
11

If 20x = 54 and 2.xy= 100, what is y?

Mathematics
1 answer:
zmey [24]3 years ago
8 0

Answer:

y=18.51

Step-by-step explanation:

First we must figure out the value of "x". We can do that in the first equation. To find the value of "x" you divide both sides by 20. That will give you the value of "x" which is 2.7. With this information, you can plug in that value into the second equation to get the value of "y". 2(2.7)(y)=100. Multiply 2 and 2.7 to get 5.4. Then divide 5.4 from both sides to get the value of "y" which is around 18.51. I hope this helped.

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Ty wants to tip 20% on a restaurant bill that is $35.40 how much moneyshould ty leave for the tip
Alex17521 [72]
We know the bill is 35.40, so that's 100% of the bill, and Dimitri wants to pay 20% of that,

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
35.40&100\\
x&20
\end{array}\implies \cfrac{35.40}{x}=\cfrac{100}{20}\implies 35.40\cdot 20=100x
\\\\\\
\cfrac{35.40\cdot 20}{100}=x
7 0
4 years ago
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What is the area of this figure?
strojnjashka [21]

Answer:

I think the area is 38

Step-by-step explanation:

area =38

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Which of the following would be the best first step when solving the following system using the substitution method?
Brilliant_brown [7]
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7 0
3 years ago
Find the solution for the following equations using substitution or elimination:
Dvinal [7]

Answer:

(4, 1)

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS
  • Equality Properties

<u>Algebra I</u>

  • Solving systems of equation using substitution/elimination

Step-by-step explanation:

<u>Step 1: Define systems</u>

2x - 3y = 5

4x + 2y = 18

<u>Step 2: Rewrite systems</u>

2x - 3y = 5

y = 9 - 2x

<u>Step 3: Solve for </u><em><u>x</u></em>

  1. Substitute:                              2x - 3(9 - 2x) = 5
  2. Distribute -3:                          2x - 27 + 6x = 5
  3. Combine like terms:              8x - 27 = 5
  4. Add 27 on both sides:           8x = 32
  5. Divide 8 on both sides:         x = 4

<u>Step 4: Solve for </u><em><u>y</u></em>

  1. Define:                    2x - 3y = 5
  2. Substitute:              2(4) - 3y = 5
  3. Multiply:                  8 - 3y = 5
  4. Isolate <em>y</em> term:         -3y = -3
  5. Isolate <em>y</em>:                 y = 1

And we have our final answer!

8 0
3 years ago
Can someone plz Graph -2x+y=8
NNADVOKAT [17]
Y is 8
And X is -4 because 8 divide by -2 is -4

7 0
3 years ago
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