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Two numbers are if their product is -1?
Two numbers are negative reciprocals if their product is -1. The numbers 1/2 and -2 are negative reciprocals. Their product is -1. This is often seen in problems involving the slopes of two lines. The slopes of perpendicular lines are negative reciprocals. Their product is -1.
Why product of slopes of perpendicular lines is -1?
Because one slope is positive while the other slope is a negative reciprocal of it. For example: 2*-1/2 = -1
Y equals 5-2x and 2y plus x equals 1 are the lines perpendicular?
Solve both equations for y in terms of x: y = (-2)x+5 y = (-1/2)x+1/2 Multiply the slopes together: (-2) X (-1/2) = 1 In order for the lines to be perpendicular, the product of the slopes would have had to equal -1, but it equals 1, so they're not perpendicular.
For perpendicular lines if the slope of one line is -2 what is the slope of the line perpendicular to it?
For any two perpendicular lines (save a vertical and a horizontal one), the product of their slopes is always -1. For two perpendicular lines with one having a slope of -2, the other will have a slope equal to -1 divided by -2, which equals 1/2.
Can 2 parallel lines have different slopes?
No
