Use function notation to write the equation of the line.

algebra unit 1 lesson 4 assessment question 1

A.
f (x) = 2x – 1

B.
f (x) = –2x – 1

C.
f (x) = –2x + 1

D.
f (x) = – x – 1

This is really hard for me! Help!

Question

Use function notation to write the equation of the line.
 
 algebra unit 1 lesson 4 assessment question 1    
 
 A.
f (x) = 2x – 1
 
 B.
f (x) = –2x – 1
 
 C.
f (x) = –2x + 1
 
 D.
f (x) = –   x – 1

This is really hard for me! Help!

anonymous · Answer

http://static.k12.com/calms_media/media/330000_330500/330014/1/96ea91906e83f413894b3efee43fb26cacfdd503/MS_ALG_S2_01_04_quiz_Q1_question.gif

anonymous · Answer

@sourwing

anonymous · Answer

@ganeshie8

ganeshie8 · Answer

equation of a line :-

$f(x) =  mx + b$

ganeshie8 · Answer

$m$ is slope
$b$ is y-intercept

ganeshie8 · Answer

look at the graph,
notice that the line is falling down 2 units, for every 1 unit to right

ganeshie8 · Answer

so, $m =  \frac{-2}{1}$

ganeshie8 · Answer

so the function wud be :-

$f(x) =  -2x + b$

anonymous · Answer

Ohh so you make it into a fraction for how often it falls?

ganeshie8 · Answer

you still need to find "y-intercept" and plugin

ganeshie8 · Answer

yes !

ganeshie8 · Answer

slope is just "how much the line is falling/rising as u move right"

ganeshie8 · Answer

do u knw how to find $b$ value ha ?

anonymous · Answer

Still kinda confused, on that.. Were/how would you start?

ganeshie8 · Answer

look at the graph, 
can u tell me where the line is crossing y-axis ?

anonymous · Answer

Yes

anonymous · Answer

At -1

ganeshie8 · Answer

yes ! so, $b = -1  $

anonymous · Answer

Ohhh It make so much more sense now!

ganeshie8 · Answer

the funciton wud be  :-

$f(x) = -2x -1$

ganeshie8 · Answer

glad to hear :) u wlc !

anonymous · Answer

So it's b!