1.6x - 3.2y = 16
3.2y = 1.6x - 16
y = 0.5x - 5
So slope = coefficient of x = 0.5
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The line y = 6 is horizontal and has a slope of zero, as does any line that is parallel to it.
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5
The line 'Y = - 3' has a slope of zero. Any line parallel to it also has a slope of zero. The line parallel to it with a Y-intercept of 7 is: Y = 7
The line y=2, and all lines parallel to the x axis, have a slope of 0. The formula for this line in particular can be expressed as y=0x +2.