Question

I need some assistance on this question

Dalia buys 20 collectible gems per month. Grace sells 10 gems from her collection of 120 each month. When will Dalia have more gems than Grace? Show your work.

Answer 1

Answer: 5 months (?)

Explanation:

I believe the way you do this is by graphing a system of equations.

Dalia = 20/month (y=20x)

Grace = -10/month (y=-10x+120)

If Dalia starts at 0. and Grace starts at 120, and we assume that x is the months and y is the amount of gems, by elimination these equations meet at (5,100). So your answer if 5 (please correct me if I'm wrong :) )