Answer:
Solving the given linear system, we get x = 1 and y = -3.
The solution set is: (1,-3)
Step-by-step explanation:
We need to solve the linear system of equations.
We can write second equation y=x-4 as: 
Let:
Now, Adding equation 1 and 2
So, we get x = 1
Now, put value of x in second equation to find value of y:
So, we get y = -3
Solving the given linear system, we get x = 1 and y = -3.
The solution set is: (1,-3)
Answer:
Step-by-step explanation:
Move the decimal to the left once on both of them and time the numbers together
# of boys : # of girls
This can be written as
6:15
6 to 15, or
6/15
The equivalent expression to 
is 
Step-by-step explanation:
Step 1:
In sums like these, it is easier to take the common term out of the simplification.
In the expression , the common term between 
and 
is the term s. So we take the term s as the common factor.
So taking s out of we get 
Step 2:
If we multiply a positive with a negative we get a negative. S0 
So the equivalent expression to is
