Write a script called 'prob1.m' that solves for the variables y, and z in terms of a user inputed x. The variables y and z are defined as follows:
y = x - 30 when 0 < x < 100
= 0.20*x + 800 when x > 100
= -50 otherwise
z = -1 when x < 0
= 0 when x = 0
= 1 when x > 0
Your script should prompt the user to input a value of x (use the input function). Next it should compute the values of y and z (surpress the output at first). Finally it should explicitly display the values of x, y, and z. From with the 'hw4.m' script call 'prob1.m'.