Y = - 2X - 3
Plot this and see that a line with a negative slope can go through quadrant III.
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The slope is a negative number.
yes
Line a with a slope perpendicular to that of line b has a slope that is the negative reciprocal of line b's. So basically the negative reciprocal.
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
The negative reciprocal of the slope of the line to which it is perpendicular.