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SAT - Math - Quadratic Equations

For which of the following values of a and b does the system of equations have exactly two real solutions? y = 3 y = ax^2 + b

For which of the following values of a and b does the system of equations have exactly two real solutions?
y = 3 
y = ax2 b

A) a= -2, b= 2
B) a= -2, b= 4
C) a= 2, b= 4
D) a= 4, b= 3 

 

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