Question

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

Answer 1

Yeah I think whatever that dude just said was right

Answer 2

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.