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.
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What have you done so far?
The key thing to know is this result: Two lines with slopes and are perpendicular, if and only if , i.e. the product of their slopes is -1.
So see if you can find expressions for the slope of the two lines.
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