How to find the y-intercept given $A=(-1,2) B=(-2,8)$ ?

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Answer 1 · 2015-05-09T00:59:32

One method would be to determine an equation for the line through the points $A=(-1,2)$ and $B=(-2,8)$
and then substitute $x=0$ in the equation.

$(Delta_y)/(Delta_x) = (y-2)/(x+1) = (8-2)/(-2+1)$

$(y-2) = (-6)(x+1)$

$y = -6x -4$

when $x=0$ (that is, along the y-axis)
$y= -4$

The y-intercept is $(-4)$

How to find the y-intercept given A=(-1,2) B=(-2,8)A=(-1,2) B=(-2,8)?