To whoever ! : ) 18 points
design five equations, like 3x + 4 = 16. make sure that the solutions to the equations are integers. in other words, 3x + 4 = 15 wouldn't be acceptable, because the solution would be x = 11/3.

2x + 7 = 23

15x + 9 = 144

6x + 14 = 56

4x + 7 = 31

7x + 2 = 16

Step-by-step explanation:

2x + 7 = 23

2x = 16

x = 8

15x + 9 = 144

15x = 135

x = 9

6x + 14 = 56

6x = 42

x = 7

4x + 7 = 31

4x = 24

x = 6

7x + 2 = 16

7x = 14

x = 2

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.