SOLUTION: The graph of y = - 5 x squared + 9 passes through (1, 2a) in the standard (x, y) coordinate plane. What is the value of a?
Answer choices:
A. 2
B. 4
c. 7
D. -1
E. -8
I
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Question 973148: The graph of y = - 5 x squared + 9 passes through (1, 2a) in the standard (x, y) coordinate plane. What is the value of a?
Answer choices:
A. 2
B. 4
c. 7
D. -1
E. -8
I'm confused about how to most directly find this variable.
Thank you for any help with this.
Helen
Found 2 solutions by amarjeeth123, solver91311:
Answer by amarjeeth123(570) (Show Source): You can put this solution on YOUR website!
The graph of y=-5x^2+9 passes through (1, 2a) in the standard (x, y) coordinate plane.
Substituting x=1 in the equation.
When x=1 we have y=-5+9=4
2a=4
a=2
Answer = (A)
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If a point )
is on the graph of )
then \ =\ \beta)
.
Substitute your given 
-coordinate for in the expression for your function and do the arithmetic to determine the value of 
. Whatever value you get for must then be equal to 
because the point )
is an element of the set of points that comprise the graph.
John
My calculator said it, I believe it, that settles it
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