Question

How do you find x given (2,4), (x,8) and slope is -2?

Answer 1

`x=0`

Explanation:

`(y_2-y_1)/(x_2-x_1)=m`

`x_1=2`
`x_2=x`
`y_1=4`
`y_2=8`

`(8-4)/(x-2)=-2`

`4/(x-2)=-2`
`1/(x-2)=-2/4=-2`
Reciprocate both sides
`(x-2)/1=-1/2`
`x-2=-2`
`x=-2+2=0`
`x=0`