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Are the graphs of the lines in the pair parallel? Explain. y = 5x + 6 –18x + 3y = –54

User Ghasem Deh
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the slopes are diffrent 
User Manuels
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The answer is: they are not parallel because they do not share the same slope.


Facts:
1. Two parallel lines share the same slope.
2. To determine a slope, express the equations in this form:
3. m = slope
The slope of is zero, because it represents a horizontal line in the cartesian plane.
We know that a slope = rise/run... in this case there is no rise and the run goes to infinity (+ and - directions). When zero is divided by any number, the result is zero... thus the slope is zero.



User Luis Milanese
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