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IKMC 2020 - Grades 11-12 - Brazil Second Application - Self-study Question 21

IKMC · IKMC 2020 - Grades 11-12 - Brazil Second Application - Self-study

Question 21

The pictured lines $r,s$ have equations $y=ax+b$ and $y=cx+d$, respectively. Which statement is true?

Question illustration
  1. $ab+cd<0$
  2. $a+b+c+d<0$
  3. $ac+bd\ge0$
  4. $a+b+c+d>0$
  5. $abcd>0$