algebra--please help me !!

[onecrazykidd x3]

write the equation that represents the line that passes through the points (0,-4) and (3,2). please include an example because i was never taught this. thank you =)

 

[stapel]

Please see the reply already posted here.

Plug the two given points (x1, y1) and (x2, y2) into the slope formula you've memorized:

m = [y1 - y2]/[x1 - x2]

(or maybe "m = [y2 - y2]/[x2 - x1]"; the order isn't important, as long as you subtract the x's in the same order as you subtracted the y's.)

Then pick one of the (x, y) points, and plug x, y, and m into "y = mx + b". Solve for b. Then re-write the equation with m and b.

If you are requesting lessons on the topic, please try this FreeMathHelp lesson.

 

[Guest]

use the 2 sets of points to find the slope or gradient

m= (y2-y1)/ (x2-x1)

m = (-4-2)/(0-3)
m = (-6) / (-3)
m = 2

Use this slope (m=2) and 1 set of points to fill out the variables in the general equation to a straight line.
Use the set of points (3,2) and m= 2
y = m x + c
2= 2x 3 + c
2= 6 + c
-4 = c


Now place the m and c values back into the general equation for a straight line.

y= m x + c

y = 2x - 4
there you go.................

 

[onecrazykidd x3]

thank you, i already figured it out for myself but im sure if i had read that it would be very helpful. thank you