Question

Lily solved the equation 3x − 10 = -3x + 8. The explanation of her process is shown. Select the text that shows an error in her process or justification of steps, if one exists

Answer 1

I used the subtraction property of equality to achieve the solution of x = 3.

Explanation:

Lily’s process of solving the equation is correct until step 3. To achieve the solution, the division property of equality is used.

Answer 2

3x - 10 = -3x + 8

Add 3x to both sides

6x - 10 = 8

Add 10 to both sides

6x = 18

Divide both sides by 6

x = 3