Non-linear
The line should be an exponential function, as it halves in mass every time a certain amount of time has passed.
Let her sisters age be x.
=>sister .....x
Sarah.
twice x=2x. then less than 5
=> (2x-5 )
if Sarah = 15 years
by substation, 2x-5=15
Hello.
In order to solve this equation, we need to isolate the variable (in this case, the variable is x)
The first step is to use the Distributive Property and distribute 3:


Now, add 3 to both sides:



Now, subtract 2x from both sides:


Therefore, the answer is

I hope it helps.
Have a nice day.
