Hi, the problem starts out by giving:

y = 2+|x-1| and y = -(1/5)x+7

the next step in the solution book takes y = 2+|x-1| and turns it into:

3-x, x<= 1

1+x, x >=1

I know that 3-x is negative and 1+x is positive but how do you figure that out?

Thank you