Answer:
B. m = 0; b = -3
Explanation:
The slope of a line is a measure of the inclination of the line.
A horizontal line has slope = 0.
The symbol for slope is m.
m = 0
The y-intercept, b, is the coordinate of the point on the y-axis which is the intersection of the line and the y-axis.
Here, the horizontal line intersects the y-axis at -3, so b = -3.
Answer: B. m = 0; b = -3