Step 2. Let 3x be three times the age of Mr. Mustard.
Step 3. 3x-8=100 since eight less than three times my age is 100.
Step 4. Solving the equation in Step 3 yields the following steps:
Add 8 to both sides of the equation
Divide 3 to both sides of the equation
Step 5. ANSWER. Mr Mustad is 36 years old.
I hope the above steps and explanation were helpful.
For Step-By-Step videos on Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry please visit http://www.FreedomUniversity.TV/courses/Trigonometry.
Also, good luck in your studies and contact me at john@e-liteworks.com for your future math needs.