What is x if x + 2y = 100 and y = 25?
Choose the correct choice
A) 25
B) 50
C) 75
D) 100
E) 4

Rationale: "substitute y by 25 in x + 2 y = 100 x + 2 ( 25 ) = 100 x + 50 = 100 if we substitute x by 50 in x + 50 = 100 , we have 50 + 50 = 100 . hence x = 50 correct answer b"
Answer: B