Question

Yuri solved the equation below incorrectly. Explain the step where he went wrong.

fifteen times b plus one equals thirty-one

Step 1: fifteen times b plus one minus one equals thirty-one minus one
Step 2: fifteen times b equals thirty
Step 3: fifteen times b times fifteen equals thirty times fifteen
Step 4: b equals four hundred fifty

Answer 1

@texaschic101

Answer 2

15b + 1 = 31 -- subtract 1 from both sides
15b + 1 - 1 = 31 - 1 -- combine like terms
15b = 30 -- He went wrong here. He should have divided both sides by 15 instead of multiplying both sides by 15.
15b/15 = 30/15
b = 2

Answer 3

He started messing up at step 3