Answer:
3
Explanation:
let, m = -1/3
and, m1 = x
m * m1 = -1
m1 = -1/-1/3
m1 = 3......
To find the slope of a line perpendicular to a like with a gradient of -1/3, you do the negative reciprocal of -1/3 which would be 3/1 or 3.
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