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What are not horizontal and vertical lines?
Any line that is not running exactly straight up and down is not vertical. Any line that is not running exactly flat, left to right is not horizontal. Vertical and horizontal lines are always at 90 degrees to each other.
Does a square have to have a vertical line if it's got a horizontal line?
Yes. By definition a square has four equal sides and four 90º angles, so any two adjacent sides are perpendicular.
What is the slope of the line perpendicular to y5?
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.
For perpendicular lines if the slope of one line is -2 what is the slope of the line perpendicular to it?
For any two perpendicular lines (save a vertical and a horizontal one), the product of their slopes is always -1. For two perpendicular lines with one having a slope of -2, the other will have a slope equal to -1 divided by -2, which equals 1/2.
Must any lines lies in vertical plane be a vertical line?
That depends. How tough do you think it would be to draw a horizontal line or a slanting line on the wall ?
