The line that goes through the points (4, 7) and (4, –3) is a vertical line. This is because both points have the same x-coordinate, which is 4. A vertical line means it goes straight up and down.
To find the slope of the line, we use the formula for slope, which is:
Slope (m) = (y2 - y1) / (x2 - x1)
Here, our points are (x1, y1) = (4, 7) and (x2, y2) = (4, –3).
Substituting in the values:
m = (–3 - 7) / (4 - 4)
m = (–10) / 0
Since we can't divide by zero, the slope is undefined. This means the line is vertical.