Which ordered pairs match the function rule shown below?

http://media.education2020.com/evresources/2003-08-04-00-00_files/i0280000.jpg

A. ( 2, 4) and ( 4, 3)
B. ( 2, 4) and ( 4, 4)
C. ( 2, 5) and ( 4, 3)
D. ( 2, 5) and ( 4, 4)

Question

Which ordered pairs match the function rule shown below?

http://media.education2020.com/evresources/2003-08-04-00-00_files/i0280000.jpg

A.	 ( 2, 4) and ( 4, 3)
B.	  ( 2, 4) and ( 4, 4)
C.	  ( 2, 5) and ( 4, 3)
D.	  ( 2, 5) and ( 4, 4)

sonyalee77 · Answer

@jigglypuff314

jigglypuff314 · Answer

plug in the ordered pairs into  y = -x + 7
to see if they work...
so for example, for the ordered pair (2, 5)
y = -(2) + 7
   = 5
and it does match with the 5 in (2, 5)
therefore the ordered pair does work.
you keep on doing that until you can choose the option where both ordered pairs work :)

sonyalee77 · Answer

thanx could u help me with two more questions.

jigglypuff314 · Answer

sure :)

sonyalee77 · Answer

Which of the function rules below would result in the following graph? http://media.education2020.com/evresources/2003-08-04-00-00_files/i0270000.jpg A. Output = 2(Input) – 2 B. Output = 2(Input) – 3 C. Output = 3(Input) – 3 D. Output = 3(Input) – 6

jigglypuff314 · Answer

this would be the slope-intercept form: y = mx + b
where m = slope = rise/run  and  b = y-intercept = where the line crosses the y-axis
so for the given graph you can see that for every time you move to the right 1, it goes up 3
so your slope would be 3
then if you were to continue the graph on the downward side, 
so (2, 0) then (1, -3) then (0. -6)
so then the y-intercept would be -6
so plug in m = 3 and b = -6 into the y = mx + b equation

sonyalee77 · Answer

lastly In the lab, when you selected the “Show Probe” box, a red probe line appeared as it does below. Which of the following answers best describes the “input” and “output” points shown? http://media.education2020.com/evresources/2003-08-04-00-00_files/i0290000.jpg http://media.education2020.com/evresources/2003-08-04-00-00_files/i0290001.jpg http://media.education2020.com/evresources/2003-08-04-00-00_files/i0290003.jpg http://media.education2020.com/evresources/2003-08-04-00-00_files/i0290004.jpg

jigglypuff314 · Answer

so look at the input in relation to the output
so like for example for Input: 6; Output: 7
you look at the graph and it would not be right because when input is 6, output is 8

sonyalee77 · Answer

sorry for the late reply and thank you :D