Lines a and b are perpendicular. the slope of line a is −2. what is the slope of line b?

Step-by-step explanation:

I will call the slope of line , and the slope of line .

For two lines to be perpendicular, the following must be satisfied:

in this case we know:

so:

And clearing for the slope of line :

The slope of the line which is perpendicular to line is

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