Need don't know this but need from other

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with