Answer:
-54
Step-by-step explanation:
9514 1404 393
Answer:
x = 5
Step-by-step explanation:
We can subtract 3x, add 12, and divide by 4.
7x -12 = 3x +8
4x -12 = 8 . . . . . . . . subtract 3x
4x = 20 . . . . . . . . . . add 12
x = 5 . . . . . . . . . . . . divide by 4
Answer:
Function: ![x+y=9](https://tex.z-dn.net/?f=x%2By%3D9)
Not Function:
and ![x=y^2](https://tex.z-dn.net/?f=x%3Dy%5E2)
Step-by-step explanation:
Given
![x+y=9](https://tex.z-dn.net/?f=x%2By%3D9)
![x^2+y^2=1](https://tex.z-dn.net/?f=x%5E2%2By%5E2%3D1)
![x=y^2](https://tex.z-dn.net/?f=x%3Dy%5E2)
Required
Determine if
is a function of ![x](https://tex.z-dn.net/?f=x)
Solving x+y=9
![x+y=9](https://tex.z-dn.net/?f=x%2By%3D9)
Make y the subject of formula
![y = 9 - x](https://tex.z-dn.net/?f=y%20%3D%209%20-%20x)
<em>Hence; y is a function of x</em>
Solving ![x^2+y^2=1](https://tex.z-dn.net/?f=x%5E2%2By%5E2%3D1)
![x^2+y^2=1](https://tex.z-dn.net/?f=x%5E2%2By%5E2%3D1)
Subtract x² from both sides
![y^2=1 - x^2](https://tex.z-dn.net/?f=y%5E2%3D1%20-%20x%5E2)
Square root of both sides
![y =\± \sqrt{1 - x^2}](https://tex.z-dn.net/?f=y%20%3D%5C%C2%B1%20%5Csqrt%7B1%20-%20x%5E2%7D)
This implies that
or ![y =-\sqrt{1 - x^2}](https://tex.z-dn.net/?f=y%20%3D-%5Csqrt%7B1%20-%20x%5E2%7D)
<em>Because </em>
<em> can be any of those two expressions, it is not a function.</em>
Solving ![x=y^2](https://tex.z-dn.net/?f=x%3Dy%5E2)
![x=y^2](https://tex.z-dn.net/?f=x%3Dy%5E2)
Reorder
![y^2 = x](https://tex.z-dn.net/?f=y%5E2%20%3D%20x)
Take square roots
![y = \±\sqrt{x}](https://tex.z-dn.net/?f=y%20%3D%20%5C%C2%B1%5Csqrt%7Bx%7D)
This implies that
or ![y = -\sqrt{x}](https://tex.z-dn.net/?f=y%20%3D%20-%5Csqrt%7Bx%7D)
<em>Because </em>
<em> can be any of those two expressions, it is not a function.</em>
30x = 100 , x = 10/3 ......anything to ask please pm me
Answer:
Step-by-step explanation: Sorry I don't know the answer.