Thread: finding x and y and finding their relationship.

1. finding x and y and finding their relationship.

If the line through (-2,4) and (1,y) is perpendicular to one through (-2,4) and (x,2), find the relationship between x and y.

2. What have you done so far?

The key thing to know is this result: Two lines with slopes $a$ and $c$ are perpendicular, if and only if $ac = -1$, i.e. the product of their slopes is -1.

So see if you can find expressions for the slope of the two lines.