수식 3: "x" equals negative 1.2 5 left brace, negative 1.5 5 less than or equal to "y" less than or equal to 1.5 5 , right bracex=−1.25−1.55≤y≤1.55
3
수식 4: "y" equals 0.5 "x" minus 0.9 5 left brace, negative 1.2 5 less than or equal to "x" less than or equal to 1.9 , right bracey=0.5x−0.95−1.25≤x≤1.9
4
수식 5: "y" equals negative 0.5 "x" plus 0.9 5 left brace, negative 1.2 5 less than or equal to "x" less than or equal to 1.9 , right bracey=−0.5x+0.95−1.25≤x≤1.9