Question

The graph below shows a line segment AB:

Which of the following equations best represents the line segment AB?

y = -3x + 2

y = -2x + 1

y = -3x - 2

y = -2x - 1

Answer 1

@kx2bay

Answer 2

@ganeshie8 @phi

Answer 3

You want to find the line segment in the form of \[y = mx + b\] Where m is the slope\[m = \frac{ \Delta Y }{ \Delta X }= \frac{ (Y_2-Y_1) }{ (X_2-X_1) }\]

Answer 4

i don't understand

Answer 5

B = the y-intercept

Answer 6

ok and A is x right

Answer 7

Use 2 point on your line (preferably the 2 end points) and solve for the slope and then find where the goes through the y-axis (0, y) )and the y value will be your b

Answer 8

slowly im understaning

Answer 9

5,-4

Answer 10

Those are 2 Y-axis coordinates.

Answer 11

so -1?

Answer 12

it's below 5 but not ending at -1

Answer 13

Point A will be (X2,Y2) and point B will be (X1,Y1) or the opposite way around its up to you

Answer 14

use these coordinates :
A = (-1, 5)
B = (2, -4)

Answer 15

try to find slope(\(m\)) using the slope formula

Answer 16

is it D?

Answer 17

that's the on;y one that seems logical to me.

Answer 18

nope, did u find the slope yet ?

Answer 19

how do i find the slope?

Answer 20

You can actually tell right away that it is not D, find the slope or the y-intercept and you will find your answer

Answer 21

The y-intercept is at 2, so in the equation \[y=mx+b\]b=2, which gives you\[y=mx+2\]The line passes through (1, -1), so plug in (1, -1) into the equation above to get the value of 'm'

Answer 22

you got two points A and B,
you can use the slope formula :
http://www.algebra-class.com/image-files/slope-formula-2.gif