Question

What is the equation of the line between `(-3,3)` and `(-4,1)`?

Answer 1

`y=2x+9`

Explanation:

`P_1=(x_1-y_1)" "P_2=(x_2,y_2)`

`x_1=-3`
`y_1=3`
`x_2=-4`
`y_2=1`

`(y_2-y_1)/(x_2-x_1)=(y-y_2)/(x-x_2)`
`(1-3)/(-4+3)=(y-1)/(x+4)`
`2/1=(y-1)/(x+4)`
`y-1=2(x+4)`
`y=1+2x+8`
`y=2x+9`