Hi !
If you "solve" this inequation you will found that :
![y-3\geq 10\\\\\boxed{\boxed{y\geq 13}}](https://tex.z-dn.net/?f=y-3%5Cgeq%2010%5C%5C%5C%5C%5Cboxed%7B%5Cboxed%7By%5Cgeq%2013%7D%7D)
On a graph, this means that you will take every values of
y ≥ 13.
The blue side is the domaine.
Answer:
https://photomath.net/s/1rp76m
Non proportional because 2×$2.40= $4.80 which is not equal to $3.50
Factor
find roots
determine intervals between roots for which function is positive or negative
sketch
or use calculus either way