Question

Write the equation of the line and draw the graph of the line through each pair of points given. Use either the slope-intercept equation or by using x- and y-intercepts >>(2, -1) and (0, 4)

Answer 1

do you know this
\[ m=\frac{y_0-y_1}{x_0-x_1} \]
?

Answer 2

no..

Answer 3

the equation gives you the slope of the line passing through 2 given points
you have to points you need to find the slope.
just plug in the number you are given!

Answer 4

i dont know which ones to plug

Answer 5

@coolaidd -- do you have graph paper handy?

Answer 6

i actually do not.. but i could probably write it on regular paper?

Answer 7

It's much easier with graph paper.

Answer 8

i know..but i dont have it.

Answer 9

Do you have geogebra? You don't even need to install it. YOu can run it off the web.

Answer 10

The key here (I think) Is visually understanding what slope means, instead of just "plugging it into a formula".

Answer 11

Can you find :

1) rise
2) run
3) y-intercept

By looking at the picture?

Answer 12

3,2?

Answer 13

Well the line is sloping downward, so the "rise" is -3 not positive 3.

Answer 14

ok..

Answer 15

so that is exactly how you plot it..what would be the equation?

Answer 16

hello?

Answer 17

The slope-intercept equation will have the form

y = mx + b

Where m = slope (that's rise / run)

b = the y intercept (the y-value where the line touches the y-axis)

You literally pop those numbers in, and you're done. :)

Answer 18

y=-3/2x+4 ?

Answer 19

Horay! :D

Answer 20

am i right??

Answer 21

lol id never thought id get it

Answer 22

You did! :D

Seriously, use geogebra, it makes this sort of stuff very very easy to do. :) I can show you how to use if you'd like.

Answer 23

thank youu soo much! when i get more graphing questions I will definitely message you! =)

Answer 24

Here are the instructions.

Answer 25

thankss