Chapter ISG, Problem 2.11STP

a.

To determine

Explain J’s error

Explanation of Solution

Here, J has divided the equation by 2, but forgot to divide the number 6 by 3. He should have divided the entire equation by 2.

b.

To determine

Show correct steps to rectify J’s error.

Answer to Problem 2.11STP

  $7$

Explanation of Solution

Given information:

  $2x+6=20$

  $x+6=10$

  $x=4$

  $2x+6=20$

Firstly, move the 6 right side

  $2x=20-6$

To subtract the term,

  $2x=14$

Hence, on dividing, the final answer is

  $x=7$