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Question 55958: Dear tutor, I am trying to graph this problem, but Im a little unsure of my answer, can you graph f(x)=-2x+2, I also need help with these other problems to complete my assignment....
rewrite the equation -x-10y=50 as a function of x
given f(x)=4x-5, find f (a-1)
given f(x)=5x2(above the x)-3x+1 find f(-2)
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! graph f(x)=-2x + 2
Assuming you are using normal vertical 'y' and horizontal 'x' graphing paper:
Remember f(x) = y:
y = 2x + 2
Choose some values of x and find y using the above equation:
1st value as an example; x = -2:
y = 2(-2) + 2:
y = -4 + 2:
y = -2
:
x | y
-------
-2 |-2
-1 | 0
0 | 2
1 | 4
Plot these x,y coordinates and draw the line.
:
rewrite the equation -x - 10y = 50 as a function of x
- x - 10y = 50
- 10y = +x + 50
y = x/-10 + 50/-10
y = -.1x - 5
You can also write it: f(x) = -.1x - 5
:
given f(x) = 4x - 5, find f(a-1): Substitute (a-1) for x
f(a-1) = 4(a-1) - 5
f(a-1) = 4a - 4 - 5
f(a-1) = 4a - 9
:
given f(x)= 5x^2 - 3x + 1 find f(-2):Substitute (-2) for x
f(-2) = 5(-2)^2 - 3(-2) + 1
f(-2) = 5(4) - (-6) + 1
f(-2) = 20 + 6 + 1
f(-2) = 27
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