B
7(3)-3=18
21-3=18
+3 +3
21=21
Answer:
I think its a. (-2,-4)
Step-by-step explanation:
y=2


Explanation
Step 1
The y -intercept of a graph is the point where the graph crosses the y -axis.
so , let's check the graph
therefore, the y-intercept is 2
Step 2
The positive regions of a function are those intervals where the function is above the x-axis. It is where the y-values are positive (not zero)
hence, the function is potive in ( in x axis)

Step 3
negative region
The negative regions of a function are those intervals where the function is below the x-axis. It is where the y-values are negative (not zero).

I hope this helps you
Answer:
x = 0
Step-by-step explanation:
This is a vertical line, in fact the y- axis
The equation of a vertical line is
x = c
where c is the value of the x- coordinates the line passes through
All of the x- coordinates on the y- axis are zero, then
x = 0 ← equation of line