Question

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

Answer 1

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

Step-by-step 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.

Answer 2

Yeah I think whatever that dude just said was right