수식 4: "z" left parenthesis, "x" , right parenthesis equals negative .1 "x" left brace, negative 3 less than or equal to "x" less than or equal to negative 1.1 , right bracezx=−.1x−3≤x≤−1.1
4
수식 5: "a" left parenthesis, "x" , right parenthesis equals .1 8 "x" minus .2 left brace, negative 2.5 less than or equal to "x" less than or equal to negative 1.2 , right braceax=.18x−.2−2.5≤x≤−1.2
5
수식 6: "b" left parenthesis, "x" , right parenthesis equals 0.7 "x" minus 0.1 5 left brace, negative 2.3 less than or equal to "x" less than or equal to negative 1 , right bracebx=0.7x−0.15−2.3≤x≤−1
6
수식 7: "c" left parenthesis, "x" , right parenthesis equals 0.2 4 "x" minus 0.7 left brace, 2.4 , right bracecx=0.24x−0.72.4
