To calculate the slope of the line using the given points, we can use the formula for the slope (m) between two points \((x_1, y_1)\) and \((x_2, y_2)\):
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Let's take the first two points \((9, 7)\) and \((19, 12)\):
- \(x_1 = 9\), \(y_1 = 7\)
- \(x_2 = 19\), \(y_2 = 12\)
Now, substitute these values into the slope formula:
\[ m = \frac{12 - 7}{19 - 9} = \frac{5}{10} = \frac{1}{2} \]
To confirm that this slope applies to the other points, we can calculate it using another pair of points, say \((19, 12)\) and \((29, 17)\):
- \(x_1 = 19\), \(y_1 = 12\)
- \(x_2 = 29\), \(y_2 = 17\)
Now, substitute these values into the slope formula:
\[ m = \frac{17 - 12}{29 - 19} = \frac{5}{10} = \frac{1}{2} \]
The same calculation applies for the other points, therefore the slope of the line is:
\[ \boxed{\frac{1}{2}} \]