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Linear Inequalities — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsLinear Inequalities1 Mark
MCQ
If $x > 7$ then $-x > -7$ is, .$............?$
  • A
    possible
  • ✓
    certainly false
  • C
    certainly true
  • D
    depend on $x$
✓

Answer

Correct option: B.
certainly false
If we multiply by negative number on both sides of inequality then,
sign of inequality will change
i.e. if $x > 7$ then $(-1) x < (-1)^7$
$\Rightarrow -x < -7.$

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