If y = 5 then there is no slope because the line is parallel to the x axis
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Calculate the slope of the given line. Any line parallel to it will have the same slope.
I can't tell if you meant to say ' y5 ' or ' y = 5'.-- ' y5 ' is just a number. It can't be graphed, it doesn't represent a line, and the phrase"perpendicular to it" has no meaning.-- ' y = 5 ' is the equation of a horizontal line. Its slope is zero. Any vertical line,with the equation [ x = a number ] is perpendicular to it. The slope of a vertical lineis "undefined" if you want to be mathematically correct, or "infinity" if you don't care.
If you mean x-y = 5 then y = x-5 whereas it has a slope of 1 and a y intercept of -5
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The line perpendicular to a line with a slope of 1/5 has a slope of -5.