Mathematics, 04.08.2019 20:30 toxsicity

If the slope of line a is -4, and line a is perpendicular to line b which statement must be true? the slope of line b is -4 the slope of line b is 4 the slope of line b is 1/4 none of the choices are correct

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If the slope of line a is -4, and line a is perpendicular to line b which statement must be true?...