Question 258098: Determine which of the ordered pairs does NOT lie on the graph of the function
f(x)= - 2x + 5
A. (1,3)
B. (5, -5)
C. (4, -3)
D. (0,4)
Please solve & explain this so I can solve the other 14 answers.
Thank you
Dawn
Found 3 solutions by scott8148, richwmiller, drk:
Answer by scott8148(6628)   (Show Source):
You can put this solution on YOUR website! the ordered pairs are (x , f(x)) ___ f(x) is another name for y
so just "plug in" the values and see if they work
A. 3 = -2(1) + 5 ___ OK
check the rest...
Answer by richwmiller(17219)  (Show Source):
You can put this solution on YOUR website! the first number in the ordered pair is x and the second is f(x) or y
just plug in each ordered pair until you find one that does NOT work.
f(x)=-2x+5
try 1,3
f(x)=-2(1)+5
f(x)=-2+5
f(x)=3
(1,3)
That works
You are looking for the f(x) doesn't equal the y of (x,y)
You will get something like 2=4 or something that does equal the other that doesn't work
Answer by drk(1908)  (Show Source):
You can put this solution on YOUR website! Hi, here is the original question:
f(x)= - 2x + 5
A. (1,3)
B. (5, -5)
C. (4, -3)
D. (0,4)
First, replace f(x) with y. To solve these, remember that the letter goes away and the number comes to stay. Instead of x, put in the number in the x part of the coordinate and do the same for y. Doing each one, we get
A. (1,3) -> 3 = -2(1) + 5 -> 3 = 3 [true]
B. (5, -5) -> 5 = -2(-5) + 5 -> 5 = 15 [false]
C. (4, -3) -> -3 = -2(4) + 5 -> -3 = -3 [true]
D. (0,4) -> 4 = -2*0 + 5 -> 4 = 5 [false]
So, we see that B and D are false and that means (5,-5) and (0,4) DO NOT lie on the line.
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