Expression 2: StartFraction, "x" Over 200 , EndFraction plus StartFraction, "y" Over 40 , EndFraction less than or equal to 1 Has graph. To audio trace, press ALT+T.x200+y40≤1
2
Expression 3: "x" greater than or equal to 0 Has graph. To audio trace, press ALT+T.x≥0
3
Expression 4: "y" greater than or equal to 0 Has graph. To audio trace, press ALT+T.y≥0