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We assume you are graphing on a number line, not an x-y plane. Draw an "open" circle (not filled in) at -4, and a line from it across to the right end of the number line. Put an arrow on the end of the line to show that the graph continues to the right.
An infinite number. Any parallelogram can be cut in half by a line parallel to one of its sides to increase the number by one. And there is no end to that process.
No, but a line segment does line segment:._____________________. line:___________________________________________________________etc.
There is no limit to the number of y-intercepts a line can have. The axis itself is a line and it intercepts itself an infinite number of times.
Irrational numbers can be graphed at a number line, but only as an estimation.