Question

What is the equation of the line that passes through the points (2, -4) and (0, 8)?

y= 6x+ 8
y= 2x+ 8
y= -6x+ 8
y= -2x+ 8

Answer 1

First you want to find the slope of the line between the two points. You can do this by finding the change in x and y between the two points.

Answer 2

Can you tell me what the changes in x and y are?

Answer 3

i think it y= 2x+ 8

Answer 4

Or you could just plug in the points xD Yeah that sounds right.

Answer 5

Oh nvm, it isn't that

Answer 6

The slope is -6 because y changes by +12, while x changes by -2. (12/-2)=-6

Answer 7

why the slope is -2 ?

Answer 8

@Cha1234

Answer 9

It shouldn't be -2, it should be -6

Answer 10

AAAH! i'm confused

Answer 11

Slope is equal to the change in y over the change in x.

Answer 12

Y changes by +12, while x changes by -2

Answer 13

That gives us 12/-2=-6

Answer 14

\[m=\frac{ y _{2}-y _{1} }{ x _{2}-x _{1} }\]

x1=2
x2=0
y1=-4
y2=8

\[m=\frac{ 8+4 }{ 0-2 }\]

\[m=\frac{ 12 }{ -2 }\]

\[m=-6\]

\[(y-y _{1})=m(x-x _{1})\]

\[y+4=-6(x-2)\]

\[y+4=-6x+12\]

\[y=-6x+ 8\]

Answer 15

who's right?

Answer 16

I'm telling you it's m=-6...