The table below models the cost, y, of using a high-
efficiency washing machine and a standard was
machine over x number of years.
Which equation represents the cost of the high-
efficiency washing machine over a given number of
years?
Which equation represents the cost of the standard
washing machine over a given number of years?
-
Number of
Years
High-
Efficiency
Cost ($)
Standard
Cost ($)
on
After how many years of use would the washing
machines cost the same amount?
Which washing machine would be the more practical
purchase if kept for 9 years?

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

the answer is 24

step-by-step explanation:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

the answer is 62.8 cubic units