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?