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ziro4ka [17]
3 years ago
15

Solve system of equation by elimination:

Mathematics
2 answers:
777dan777 [17]3 years ago
6 0

Answer:

its b

Step-by-step explanation:

mars1129 [50]3 years ago
4 0

Answer:

a. (4, 1)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Solving systems of equations using substitution/elimination

Step-by-step explanation:

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

-x + 4y = -8

-5x - 4y = -16

<u>Step 2: Solve for </u><em><u>x</u></em>

<em>Elimination</em>

  1. Combine equations:                     -6x = -24
  2. Isolate <em>x</em>:                                        x = 4

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

  1. Define equation:                   -x + 4y = -8
  2. Substitute in <em>x</em>:                      -4 + 4y = -8
  3. Isolate <em>y</em> term:                       4y = -4
  4. Isolate <em>y</em>:                                y = -1
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Find the circumference and area of a circle with diameter 12 ft. Express your answer in terms of pie
xz_007 [3.2K]

Answer:

Circumference: 12π

Area: 36π

Step-by-step explanation:

The equation for the circumference of a circle is:

C = πd

Where C is the circumference and d is the diameter. Knowing this, we will be able to find the circumference by pugging in 12 for d.

C = 12π

And now we have found the circumference of the circle.

The equation for the area of a circle is:

A = πr²

Where A is the area and r is the radius. Remember that the diameter is double the radius, so we can find the radius:

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Now that we know r, we can find the area of the circle:

A = π(6)²

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Now we have found the area.

So the circumference is 12π and the area is 36π.

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4 0
3 years ago
Deanna gets 3 problems incorrect on her math quiz and scores 85%. How many questions were on the quiz?
katrin2010 [14]

Answer:

There were 20 questions on the quiz

Step-by-step explanation:

In this question, we are concerned with knowing the number of questions on a quiz, given that Deana had a certain percentage after scoring an amount of marks.

We proceed as follows;

Let the number of questions on the quiz be X.

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what we are saying is that it is just 15% of her questions that were wrong.

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Step-by-step explanation:

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Read 2 more answers
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Answer:

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Step-by-step explanation:

The places are determined by putting the times in increasing order.

<u>time</u>, <u>place</u>, <u>name</u>

25.85, 1st place, Sam

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32.20, 3rd place, Randy

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<em>Additional comment</em>

Sometimes it is easier to compare values when they all have the same number of decimal places.

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