Sally has only nickels and dimes in her money box. she knows that she has less than $20 in the box. let x represent the number of nickels in the box and y represent the number of dimes in the box. which of the following statements best describes the steps to graph the solution to the inequality in x and y? a) draw a dashed line to represent the graph of 5x + 10y = 2000, and shade the portion above the line for positive values of x and y. b) draw a dashed line to represent the graph of 10x + 5y = 2000, and shade the portion above the line for positive values of x and y. c) draw a dashed line to represent the graph of 5x + 10y = 2000, and shade the portion below the line for positive values of x and y. d) draw a dashed line to represent the graph of 10x − 5y = 2000, and shade the portion below the line for positive values of x and y.

The answer is the option C

Draw a dashed line to represent the graph of , and shade the portion below the line for positive values of x and y

Step-by-step explanation:

we know that

Let

x-------> the number of nickels

y-------> the number of dimes

The inequality that represent the situation is equal to

Multiply by both sides

The solution of the inequality is the shaded area below the dashed line for positive values of x and y

The equation of the dashed line is equal to  

therefore

The answer is the option C

see the attached figure to better understand the problem

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.

b

step-by-step explanation: