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:
a line graph titled color mix, with quantity of blue paint, in millimeters, on the x axis and quantity of red paint, in millimeters, on the y axis. the x axis has a scale from 0 to 9 with an increment of 1. the y axis has a scale of 0 to 18 in increments of 2. a straight line connecting 3, 2 and 7, 12 is drawn.
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