math please help

Give the equation of the line that is perpendicular to the line y=x+4 and passes through point (0, -1).

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  1. since it is perpendicular, its slope must be -1 , the negative reciprocal of +1
    so the equation must be
    y = -x + b
    but (0,-1) is the y-intercept, so

    y = -x - 1

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