Knowing that they have the same y-intercept, and knowing nothing else,
the only thing you can say about the two lines is that they have the same
y-intercept. That fact doesn't tell you anything else about them.
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No because two lines with the same slope but with different y intercepts are parallel lines. Perpendicular lines meet each other at right angles.
If you want to graph parallel lines, they need to have the same slope (Ex. 2x+2 and 2x+3)- parallel lines cannot have the same y-intercept because the two line would be the same. Perpendicular lines slopes need have to be opposite reciprocals (Ex. -2x+4 and +1/2x+3)- perpendicular lines can have the same y-intercepts, it doesn't make a difference.
Unless they are the exact same lines, no. Parallel lines do not touch. If two lines have the same intercept value, they share a point, and therefore touch.
Two lines with the same slope are parallel.
No.