What is the value of x in the system of equations?
Show the answer and explanation
Why D is right
Adding the two equations yields , so . Substituting into the second equation gives , which confirms .
Why the others are wrong
- AThis may result from calculation errors when adding the equations or dividing incorrectly.
- BThis may result from a sign error when solving the system.
- CThis is the value of y, not x. The question asks for the value of x.