Solve the system using substitution:
x+y=5
y=x - 9

x = 7

y = -2

Step-by-step explanation:

There are 2 equations. The substitution method takes one equation and puts it into the other and solves for 1 variable. Then you take that answer and put into any one equation and solve for the other variable.

Since equation #2 is already given for y = SOMETHING, we take that something and put it into "y" of the 1st equation. Shown below:

We got x = 7

Now, we know from Equation #2, y = x - 9, so

y = x - 9

y = 7 - 9

y = -2

Hence,

y = -2

In coordinate pair, the answer is (7, -2)

B; This is the graph of a function; but it is not one-to-one

Step-by-step explanation:

If you use the vertical line test, you will see that it only touches once. That shows it is a function

Then you use the horizontal line test to see if it is a one-to-one function. It is not a one-to-one function because it touches the horizontal line twice.

It is not a linear function because it is not a straight line.

This leaves you with answer B