Looking at the graph
we have a horizontal line
the equation is
y=-5
The slope of a horizontal line is equal to zero
so
m=0
The y-intercept is the point (0,-5)
therefore
b=-5
The answer is
m=0
b=-5
Remember that
y=mx+b
substitute
m=0
b=-5
y=(0)(x)-5
y=-5
