6 lbs per day means that every day 6 pounds are gained. 6 days per lb means that every 6 days 1 pound is gained (or lost)
We have one of those equations already solved for y, so let's sub that one into the other one and solve the equation in terms of x only:

. We will simplify that and at the same time bring the 6 over by subtraction to get a polynomial set to equal 0 that we can factor.

. We will factor that to get (x-3)(x+1) for x values of x = 3 and x = -1. a above is the choice that has the x values we need, -1 and 3.
Yes 5/12 is less then 2/3 because if 6/12 = 1/2 is less then 2/3 then it’s true that 5/12 is less then 2/3
Answer:
XI and IX
Line above has arrow heads on both ends.
Step-by-step explanation:
XI and IX
Line above has arrow heads on both ends.