The calculator command normalcdf returns the that a randomly selected value falls in a given reigon of a normal probability

The percentage of area under a continous probability curve from negative infinity to x.

Step-by-step explanation:

The normalcdf means the normal cumulative density function, it can be accessed from the TI Calculators from the DIST section which also includes the normalcdf, invNorm, tpdf and other distribution functions.

The syntax is as follows :

normalcdf (lower bound, upper bound, mean, standard deviation)

Hence, to Obtian the probability that a value is between a and b, with mean, x and standard deviation, s

The normalcdf is written as normalcdf(a, b, x, s)

i believe that the answer is

b. y-1=-2(x-4)

hope this !