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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