Question

Keira created color panels for a wall using a mix of only red and blue paints. She plotted the quantities of red and blue paints used for each mix and connected them using a line segment, as shown in the graph below:

Answer 1

Which statement best describes the domain of the function represented in the graph?

3 ≤ x ≤ 12 or x is between 3 and 12, inclusive
3 ≤ x ≤ 7 or x is between 3 and 7, inclusive
2 ≤ x ≤ 12 or x is between 2 and 12, inclusive
2 ≤ x ≤ 7 or x is between 2 and 7, inclusive

Answer 2

the domain are the "x values"
this should be obvious, because ll the choices are about "x"
to find the x values, put you pencil on the left end point of the line, and go "straight down" what x number to you reach ?

Answer 3

@phi Ah I see.. I might be wrong but I think its A.

Answer 4

put you pencil on the left end point of the line, and go "straight down" what x number to you reach ?

Answer 5

@phi 2?

Answer 6

go straight down (like the red line). what number are you at ?

Answer 7

@phi oh 3

Answer 8

now do the same for the right end point of the line.
put your pencil on the right end, and go straight down. what x number are you at ?

Answer 9

@phi 7 right?

Answer 10

that means the line is "defined" from x =3 to x=7
that is the domain.

Answer 11

@phi ah i see. So its B?

Answer 12

yes

Answer 13

@phi thank you so much!