The viewer calculated that the contestant answered 8 questions correctly and 12 questions incorrectly. What went wrong?
Answer
A
The viewer mistakenly determined that one of the equations in the system should be x plus y is equal to 20 .Instead modifications should have been made before applying the equation.
B
The viewer mistakenly determined that one of the equations in the system should be 2 x plus y is equal to 28 . Instead modifications should have been made before applying the equation.
C
The viewer multiplied the equation 2 x plus y is equal to 28 by negative 1 incorrectly.
D
The viewer added the equations x plus y is equal to 20 and negative 2 x minus y is equal to negative 28 incorrectly.