Problem: The fractions cx+dax+b​ and db​ are unequal if.
Answer Choices:
A. a=c=1 and xî€ =0
B. a=b=0
C. a=c=0
D. x=0
E. ad=bc
Solution:
A non-unit fraction b/d is changed in value by the addition of the same non-zero quantity x to the numerator and denominator. ∴ (A) is the correct choice.