Find the solution of the system of equation shown on the ?

So when looking for the solutions on a graph, the solution is going to be where the lines intersect. In this case, the two lines intersect at (7,-6), therefore that is your solution.

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.