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Free_Kalibri [48]
2 years ago
15

How do you decide which variable to isolate in order to use the substitution method to solve a system of linear equation?​

Mathematics
1 answer:
Kazeer [188]2 years ago
5 0
It doesn’t really matter which variable you isolate first but usually you would use the one that’s by itself already. like for example one of the equations was y = 8. you would already have your y solve for so you would just have to plug that in for y in the other equation. personally, i usually do x first unless one of the equations has either x or y by itself already. i think its easier to just do x first and then solve for y after that, but it just depends on what the equations are; sometimes it might be easier to just do y first. hope this helps!
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Freddy has a shelf that is 72 over 5 inches wide. How many catalogs can Freddy arrange on the shelf if each catalog is 4 over 5
scZoUnD [109]
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Step-by-step explanation:
Let Freddy could arrange n catalogs on the shelf.
The dimension of the shelf is:
72 over 5 inches wide.
The dimension of the catalog is:
4 over 5 of an inch thick.
n × Dimension of one catalog=Dimension of shelf.
i.e.
n×(4 over 5 inches)=72 over 5 inches
i.e.
n=72 over 5 inches/ 4 over 5 inches
i.e.
n=72/4
i.e.
n=18
5 0
3 years ago
Read 2 more answers
Find m\angle Am∠Am, angle, A.<br> Round to the nearest degree.
Oxana [17]

Answer:

m∠A = 106°

Step-by-step explanation:

All three sides of the triangle are given in the question.

To find the measure of included angle A between two sides we will apply cosine formula,

BC²= AB² + AC² - 2(AB)(AC)cosA

(13)² = (10)² + (6)² - 2(10)(6)cosA

169 = 100 + 36 - 120cosA

cosA = \frac{-169+136}{120}

cosA = -0.275

A = \text{cos}^{-1}(-0.275)

A = 105.96°

A ≈ 106°

Therefore, m∠A = 106° will be the answer.

3 0
3 years ago
The sum of twice a number n and 8 at most 25
mezya [45]

2n + 8 ≤ 25     |subtract 8 from both sides

2n ≤ 17     |divide both sides by 2

<u>n ≤ 8.5</u>

6 0
3 years ago
Kara’s car used 1/16 gallons of gas to drive 1/8 of a mile at this rate how many miles can Kara’s car drive using one gallon of
marissa [1.9K]
Answer is 2 miles
Hope this helps
8 0
2 years ago
1.9/10 times 3/6 then simplified
givi [52]
1) 0.095
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7) 0.6
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3 years ago
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