A-3b=9
a=b-3
b-3-3b=9
-2b-3=9
-2b=12
2b=-12
b=-6
a=-6-3
a=-9
Solution: (-9,-6)
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Check:
-9=-6-3
-9=-9
TRUE
Answer:
oil and sugar
Step-by-step explanation:
We have to find the parameter a so that (-1,2) is part of the function f(x) = ax²+4.
To check if a point is part of a function, we can replace the values of x and y = f(x) with the coordinates of the point and then, if the equation stays true, then the point is part of the function.
So for (x,y) = (-1,2) to be part of the function y = f(x), this equation has to stands true:
![\begin{gathered} y=f(x) \\ y=ax^2+4 \\ 2=a(-1)^2+4 \\ 2=a+4 \\ a=2-4 \\ a=-2 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20y%3Df%28x%29%20%5C%5C%20y%3Dax%5E2%2B4%20%5C%5C%202%3Da%28-1%29%5E2%2B4%20%5C%5C%202%3Da%2B4%20%5C%5C%20a%3D2-4%20%5C%5C%20a%3D-2%20%5Cend%7Bgathered%7D)
Then, the function would have to be f(x) = -2x² + 4.
We can check with a graph as:
Answer: a = -2
Answer: DECAY
Step-by-step explanation:
(.85) is less than 1