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Line EF passes through the points (0, 1) and (3,3). Line JK passes through the points (8, 2) and (6, 5). These lines are
Slope of first line = rise/run = y2-y1/(x2-x1) = (3-1)/(3-0) = 2/3
Slope of second line = 3/-2 = -3/2
The second slope is the negative inverse of the first, so the lines are perpindicular