Answer:
5
Step-by-step explanation:
The rate of change of y=3 is 0, because it will always be 3, no matter the x value (and it never changes). The rate of change of y=5x+4 is just 5 (the rate of change of any line is just its slope [disregard the shift]. Then subtract 0 from 5, 5-0= 5. So 5 more. Hope this helps.