That kind of depends on what is being graphed.
-- On a graph of acceleration vs time, the graph is a straight line that lays
right on top of the x-axis, because the acceleration is a constant zero.
-- On a graph of speed vs time, constant speed is a horizontal line, parallel
to the x-axis.
-- On a graph of distance vs time, constant speed is a straight line with a
positive slope; that is, it rises as it progresses toward the right.
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The x-t graph can't tell you anything about direction, so you can only make observations regarding speed, not velocity. For constant speed, the x-t graph is a straight line. The slope of the line is numerically equal to the constant speed.
A straight line.
The straight horizontal line on the graph says: "Whatever time you look at, the speed is always the same". This is the graph of an object moving with constant speed.
A straight line, through the origin, sloping up from left to right. The gradient of the graph will be the constant of proportionality.
According to the ideal gas law, pressure times volume is constant. We'll call that constant c. PV=C, P=c/V, so pressure is inversely related to volume, so it would look like the graph y=1/x multiplied by a constant.