Four times a number plus three times a second number is negative nine. Twice the first number plus the second number is three

Taking algebra two apex courses and need with these questions

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?