CAYLEY 2010 Problem 9

Past Contests CAYLEY CAYLEY - 2010
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Which of the following lines, when drawn together with the x-axis and the y-axis, encloses an isosceles triangle?

Answer Choices
A. y=4x+4
B. y=\frac12x+4
C. y=-x+4
D. y=2x+4
E. y=-3x+4