Answer:
The system that can be used is:


Step-by-step explanation:
We have that:
x is the price of a package of sugar cookies, y is the price of a package of oatmeal cookies.
Shaikha sold 10 packages of sugar cookies and 2 packages of oatmeal cookies for $56.
This means that:

Khalid sold 9 packages of sugar cookies and 3 packages of oatmeal cookies for $60.
This means that 
System that can be used:
The system that can be used is:


Answer:
answer what?
Step-by-step explanation:
Linear. Each increase of 1 in x means a decrease of 3 in y, so it has a consistent slope of -3
Answer: The constant of proportionality is 5 because the equation would be y=kx but instead of k it has 5.
Answer:
1
Step-by-step explanation:
To find x, set both equations equal to each other.






