Which conditional and its converse form a true biconditional

Asked by maham237 @ 13/01/2021 in Mathematics viewed by 301 People

Which conditional and its converse form a true biconditional?
A) If x>0, then lxl >0
B) If x=3, then x2^2=9
C) If x^2 =4, Then x=2
D) If x=19, then 2x-3=35

Answered by maham237 @ 13/01/2021

The answer is
D) If x=19, then 2x-3=35

proof

If x=19, 2(19)-3=38-3=35 so If x=19, then 2x-3=35 is verified
if 2x-3=35, so 2x=35 + 3, 2x=38 implies x = 19, so x =19 is verified

If x=19 if and only if 2x-3=35

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