Rate of change of y respect to x as y=4-5/8x

Given a funtion in slope-intercept form:

y=mx+b

m=slope or rate of change.

b=y-intercept.

In tyis funtion:

y=4-5/8 x

y=-5/8 x+4

m=is the number beside "x"=-5/8

Therefore:

the rate of change of y respect to x will be - 5/8.