A number multiplied with it's reciprocal must be one. So for example if you have -(1/2), than it's reciprocal is -2.
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The negative reciprocal of any gradient gives the gradient of the line perpendicular to it. If you had a line of gradient 2, the negative reciprocal would be -1/2 Just change the sign on the number and flip the number/fraction to get the negative reciprocal.
The reciprocal of a number plus the reciprocal of twice the number equals Find the number. 1/2 find the number
The reciprocal of a number is 1 divide by that number - the reciprocal of -3 is 1/(-3), or -1/3. So, the negative reciprocal of -3 would be 1/3 (without the minus sign).
A reciprocal is the number flipped and multiplied by a negative, so 15/1 as a reciprocal is -1/15.