What you’ll learn
Write inequalities from situations.
Key idea
Strict comparisons exclude the boundary itself; test a point on each side.
Do not reverse the comparison side or include the boundary; inclusive symbols appear only as rejected flawed models.
Worked example
Enter the exact value or ordered values in the format requested below.
A sensor value x must be strictly less than -13. Write the strict inequality; equality does not qualify.
- The comparison requires x strictly less than -13.
- Use x<-13; the boundary is excluded and test value -14 is included.
Answer: x<-13
Quick Check
Choose which candidate representation satisfies the requirements of 'Write inequalities from situations' and justify the choice.
Select an inequality matching 'strictly greater than 0' and table rows x=0 excluded, x=1 included.