Suppose the equation of the line is y = mx c where m is not zero.Then the x-intercept is (-c/m, 0) and the y-intercept is (0, c)
Therefore -c/m + c = k
multiplying by m, -c + cm = km
or c*(m -1) = km
and so, provided (m - 1) is not 0, c = km/(m - 1)
and the equations of the line are y = mx + km/(m - 1) for different values of m.
When m - 1 = 0, then m = 1 and so the equations are y = x + c so that the intercepts are (-c, 0) and (0, c) and so 2*c = k so the equation is y = x + k/2
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If they are straight lines, then one solution.
If the slopes are different the lines are neither - they intersect. They are parallel or coincident if the slopes are the same. Then, if the y-intercepts are the same they are coincident while if the y-intercepts are different, they are parallel.
Lines with the same slope but with different y intercepts are parallel.
Same slope and intercepts
Yes, parallel lines have different intercepts