If a and b are real numbers and if y = ax + b is a direct variation equation, what do you know about a and b?

Simplify the expression. enter the correct answer.

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9