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OLga [1]
3 years ago
8

Which choice is the most efficient first step to solve this set of equations? y=3x-5 and 2x+6y=20

Mathematics
2 answers:
lesya [120]3 years ago
4 0

Answer:

We substitute the value of y in equation (1) into (2)

Step-by-step explanation:

y=3x-5.........(1)

2x+6y=20........(2)

stepan [7]3 years ago
3 0
Plug in 3x-5 to the second equation for every y value. (This is substitution)
2x +6(3x-5)=20
2x+18x-30=20
20x=50
x=2.5

Then solve the first equation with your x value

y=3(2.5)-5
y=7.5-5
Y=2.5

To check plug the numbers into both
EQ 1: 2.5=7.5-5
EQ 2: 5+15=20

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melisa1 [442]

144+64= 178

\sqrt{178  }  = 13.3

a^2+b^2= c^2

Whenever finding a missing length use the formula up above :

a^2+b^2= c^2

a^2-b^2= c^2

144-64= 80

\sqrt{80}  =  \sqrt{16 }  \times  \sqrt{5}  = 4 \sqrt{5}  = 8.9

Answers are 13.3 and 8.9

6 0
3 years ago
Celina measured the height of a window frame as 5.55 feet, but the actual height was 6 feet. What is the percentage of error in
dexar [7]
The answer would be 0.45 feet because you have to take the 6 and subtract 5.55 feet from it. Your equation would be x+5.55=6.
7 0
3 years ago
When finding the margin of error for the mean of a normally distributed population from a sample, what is the critical probabili
svlad2 [7]

Critical probability is the essentially cut-off value. The critical probability when the confidence level of 58% is 0.79.

<h3>What is the critical probability?</h3>

Critical probability is the essentially cut-off value that defines the region where the test statistic is unlikely to lie.

As it is given that the confidence level is 58%. therefore, in order to calculate the critical probability, we need to calculate the margin of error within a set of data, and  it is given by the formula

\rm Critical\ Probability, (P*) = 1-\dfrac{\alpha }{2}

where the value of the α is expressed as,

\alpha= 1 -\dfrac{\rm Confidence\ interval}{100}

Now, as the confidence interval is given to us, therefore, the value of the alpha can be written as,

\alpha= 1 -\dfrac{\rm 58\%}{100} = 0.42

Further, the critical probability, assuming a confidence level of 58% is,

\rm Critical\ Probability, (P*) = 1-\dfrac{\alpha }{2}\\\\\rm Critical\ Probability, (P*) = 1-\dfrac{0.42}{2} = 0.79

Hence, the critical probability is 0.79.

Learn more about Critical Probability:

brainly.com/question/5625386

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2 years ago
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drek231 [11]
The answer would be B
6 0
3 years ago
How many different 12-letter arrangements can be made using the letters in the word indianapolis?
Alona [7]

Answer:

764

Step-by-step explanation:

8 0
4 years ago
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