Question 124921
Are the following lines parallel, perpendicular, or neither?   
L1 with equation x – 2y = 10   
L2 with equation 2x + y = 2
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Put both is slope-intercept form:
L1: y = (1/2)x-5
L2: y = -2x + 2
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The slopes are negative reciprocal of one another so the lines are perpendicular.
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Cheers,
Stan H.