Plzzz me with number 5 part c don’t understand

Y=mx+b

m=slope
b=y intercept

we already know the slope, the rate of change, which is 23

y=23x+b

to find b, we need to find savings at week 0, and what we need to do to find that is subtract 23 from 81, which is 58

thus

y=23x+58

Y=mx+b
m= is the slopeb=y  is the intercept
you already know the slope--> the rate of change, which is 23
--> y=23x+b
to find b, we need to find savings at week 0, and what we need to do to find that is subtract 23 from 81, which is 58
so that means the final answer is > y=23x+58