We are given that Kristine spends $20 and saves the rest each time she get paid.
We can use slope-intercept form y=mx+b to represent the equation.
Where x represents the amount Kristine earns and y represents the amount she saves.
Kristine spends $20. Therefore b= -20.
Plugging mx as just x and b=-20.
y = x-20.
If we plug y=0, we get
0 = x-20
x=20.
We can see in 4th option we have x-intercept =20.
Therefore, correct option is 4th option.