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

1 Answer
Alan P.
May 9, 2015

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

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