What is the slope of a line that is perpendicular to a line with a slope of -2?

The slopes m1 and m2 of any two perpendicular lines is given as:

m1 * m2 = -1

Here, say m1 = -2
Then,
m2 = -1/m1
Or m2= -1/-2
Or m2 =2

Thus, the slope of 2nd line will be 2.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.