The factory produce 11 shirt in half minute (30 seconds)
110 because 7 x 5 x 3.14159= 109.95565
The slope would be calculated as m = (y2 -y1)/(x2-x1)
So plugging in it would be m = (10- (-4))/(6-2) = 3.5
Then plugging into point slope form which is y - y1 = m(x - x1)
You would get y - 10 = 3.5(x-6) which simplifies is
Y = 3.5x -11
Constant rate means its the same rate and didn't change over time