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Just number 7 would be fine but if you could also number 8 would help a lot​

Just number 7 would be fine but if you could also number 8 would help a lot​-example-1

2 Answers

4 votes
Yeah I think whatever that dude just said was right
User Lalji Tadhani
by
7.5k points
6 votes

Answer:

7. r = -5

8. x = -1

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

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

Equality Properties

Explanation:

Step 1: Define

r + 2 - 8r = -3 - 8r

Step 2: Solve for r

  1. Combine like terms: -7r + 2 = -3 - 8r
  2. Add 8r to both sides: r + 2 = -3
  3. Subtract 2 on both sides: r = -5

Step 3: Check

Plug in r into the original equation to verify it's a solution.

  1. Substitute in r: -5 + 2 - 8(-5) = -3 - 8(-5)
  2. Multiply: -5 + 2 + 40 = -3 + 40
  3. Add: -3 + 40 = -3 + 40
  4. Add: 37 = 37

Here we see that 37 does indeed equal 37.

∴ r = -5 is a solution of the equation.

Step 4: Define equation

-4x = x + 5

Step 5: Solve for x

  1. Subtract x on both sides: -5x = 5
  2. Divide -5 on both sides: x = -1

Step 6: Check

Plug in x into the original equation to verify it's a solution.

  1. Substitute in x: -4(-1) = -1 + 5
  2. Multiply: 4 = -1 + 5
  3. Add: 4 = 4

Here we see that 4 does indeed equal 4.

∴ x = -1 is a solution of the equation.

User Karl Wilbur
by
7.8k points

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