A math class is having a discussion on how to determine if the expressions 4x−x+5 and 8−3x−3 are equivalent. The class has suggested four different methods. Which describes the correct method?
Answer
A
Both expressions should be evaluated by substituting any two values for x . If for each substituted value, the final values of the expressions are the same, then the two expressions must be equivalent.
B
Both expressions should be evaluated by substituting any two values for x . If for each substituted value, the final values of the expressions are positive, then the two expressions must be equivalent.
C
Both expressions should be evaluated by substituting with one value for x . If the final values of the expressions are the same, then the two expressions must be equivalent.
D
Both expressions should be evaluated by substituting one value for x . If the final values of the expressions are both positive after the substitution, then the two expressions must be equivalent.