Maths-
SAT
Easy

Question


The graph of y = ax2 + c, where a and c are constants, is shown. What is the value of a ?

The correct answer is: 0.25


    We can get from the graph that y = ax2 + c graph meets y – axis at (0, 2)
    So, c = 2
    Then y = ax2 + 2
    Take any one of the point of (-4, 6) (-2, 3) (2, 3) (4, 6) we can at a = 1
    Assume (2, 3) substitute in y = ax2 + 2
    Then 3 = a.22 + 2
    4a = 1
    a = 1/4.

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