Question

Cool-down Melanie and Kala each started solving equation 2 for x. 1 (7x – 6) = 6x – 10 The result of Melanie's first step was: 3.5x = 6 = 6x - 10 The result of Kala's first step was: 7x - 6= 12x - 20 One of them made an error. Who was it, and what was the error?

I need to find who made the error and what was the error ​

Answer 1

Kala's first step.

Explanation:

Solving linear equations.

1. Step 1: Simplify each side, if needed.
2. Step 2: Use Add./Sub. Properties to move the variable term to one side and all other terms to the other side.
3. Step 3: Use Mult./Div.
4. Step 4: Check your answer.
5. I find this is the quickest and easiest way to approach linear equations.
6. Example 6: Solve for the variable.

But Kala did not do that. Instead, she skipped the first stages and moved on ahead, making her equation invalid.