Which of the following describes the graph of the equation (x+y)^{2}=x^{2}+y^{2} ?
Answer Choices
A. the empty set
B. one point
C. two lines
D. a circle
E. the entire plane
Which of the following describes the graph of the equation (x+y)^{2}=x^{2}+y^{2} ?
Answer Choices
A. the empty set
B. one point
C. two lines
D. a circle
E. the entire plane