The point (2,19) lies:
c. below and to the right of the line y = 3 + 7x
Nope,
If we replace the x in our equation (y = 3 + 7x) with a 2, we would get y = 3 + 7(2) = 3 + 14 = 17. So the point falling on the line at an x-value of 2, will have a y-value of 17 (2, 17), but our point (2, 19) is above that (not below). However, you are correct that if the point given was below the line, which it was not, it would have been "to the right of the line." In this equation (y = 3 + 7x), we know we have a rather steep positive slope of +7 that crosses the y-axis at 3. The picture on the left shows a steep positive slope. The picture on the right shows that everything below that line is to the right of the line.