Hello I don't need the answer to this problem because its only Practice. Its merely there for an example. I am not sure how to do this type of math and I would really appreciate if you wrote a step by step explanation. Please help me. Thank Youu!

We have the slope m = (6-3)/(4-1) = 3/3 = 1;

Then, y - 3 = 1·( x - 1);

finally, y = x + 2.

I hope this helps I'm not 100% sure about this one

check the picture below.

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.