tendays2go wrote:as for two lines to be perpendicular, their slopes should multiply to -1
yes.
a more
functional way to think of this is that the slopes should be OPPOSITE RECIPROCALS of each other.
in other words, you take the fraction that represents the slope,
flip the fraction, and
change the sign.
since you want a line that's perpendicular to a line with a slope of -2 (= -2/1), you want a slope of +1/2.
Ron has been teaching various standardized tests for 20 years.
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