isi-entrance 2016 Q28

isi-entrance · India · UGB 4 marks Simultaneous equations
Let $a$ be a real number. The number of distinct solutions $(x, y)$ of the system of equations $( x - a ) ^ { 2 } + y ^ { 2 } = 1$ and $x ^ { 2 } = y ^ { 2 }$, can only be
(A) $0, 1, 2, 3, 4$ or 5
(B) 0, 1 or 3
(C) $0, 1, 2$ or 4
(D) $0, 2, 3$, or 4
Let $a$ be a real number. The number of distinct solutions $(x, y)$ of the system of equations $( x - a ) ^ { 2 } + y ^ { 2 } = 1$ and $x ^ { 2 } = y ^ { 2 }$, can only be\\
(A) $0, 1, 2, 3, 4$ or 5\\
(B) 0, 1 or 3\\
(C) $0, 1, 2$ or 4\\
(D) $0, 2, 3$, or 4