What is the graph of the inequality
x ≤ 5

Step-by-step explanation:

The graph of x ≤ 5  is a vertical line.

Vertical lines have undefined slopes are symbolically represented by the equation, x = a where a is the x-intercept.  The same goes with linear inequalities—you would graph it the same way you normally graph a linear equation.

Another important detail to remember with graphing linear inequalities is the inequality symbol used.  If you have "≤ " or " ≥ ,"  then you will have a solid line for your boundary line. If the linear inequality has "<" or ">," then you will use a dashed line for the boundary line.

To graph x ≤ 5, start at point (5, 0), then draw a vertical line from that point. You will also shade the region below, given the inequality symbol, "≤ ."

Attached is a screenshot of the graphed linear inequality, x ≤ 5.        

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.