Answer:
Slope (m): The slope of a straight line passing through two points (x1, y1) and (x2, y2) is given by the formula: m = (y2 - y1) / (x2 - x1).
Calculation of the slope (m):
m = (-4 - (-4)) / (9 - 1)
m = 0 / 8
m = 0
Calculation of the ordinate at the origin (b):
We can use any of the two points, let's take (1, -4):
y = mx + b
-4 = 0 * 1 + b
b = -4
the equation of the line is:y = 0x - 4