Which ordered pair is the best estimate for the solution of the system of equations? y = -3/4x - 2 y = x + 6 a: (-4.25,1.5) b: (-4.5,1.5) c: (-4.5,1.75) d: (-4.75,1.75)

none of the given options is right.

step-by-step explanation:

y = -3/4x - 2

y = x + 6

are the given equations.

since both the equations are of the form y = we can eliminate y easily.

x+6 = -3x/4-2

multiply by 4

4x+24 =-3x-8

7x = -8-24 = -32

x = -32/7

y =x+6 = -32/7+6 = 10/7

answer is (-32/7, 10/7)

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.

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2