For this case we must solve the following system of equations:

To solve we follow the steps below:
We multiply the second equation by -3:

Thus, we have the equivalent system:

We add the equations:

We look for the value of the variable "y":

Thus, the solution of the system is given by:

Answer:

This is a simply problem. Just divide both sides the coefficient of x. Which is -2.
And the answer will be x = -4
The number that you are trying to find is 5
Answer:
1 piece of yarn per doll
Step-by-step explanation:
1×4