They have the same slope. If you write the lines in the slope-intercept form, you will get, for each line:
y = ax + b
where a is the slope, and b is the y-intercept (where the line crosses the y-axis). For two or more parallel lines, the coefficient "a" will be the same.
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Parallel lines have the same slope.
A system of equations will have no solutions if the line they represent are parallel. Remember that the solution of a system of equations is physically represented by the intersection point of the two lines. If the lines don't intersect (parallel) then there can be no solution.
They are the same.
If you refer to linear equations, graphed as straight lines, two inconsistent equations would result in two parallel lines.
Although there is no graph, the number of solutions is 0.