Here are the meanings of the components or symbols used in the least squares equation of
*
y = a + bx
*
:

*
y
*
is the 游戏电竞线上外围APP v5.2
*
dependent
*
variable, such as the estimated or expected
*
total cost of electricity
*
during a month. The amount of
*
y
*
is dependent upon the amounts of
*
a
*
and
*
bx
*
.

*
a
*
is the 游戏电竞线上外围APP v5.2 estimated total amount of
*
fixed electricity costs
*
during the month. It is the 游戏电竞线上外围APP v5.2 value of
*
y
*
, when
*
x
*
is zero. If the total cost line intersects the y-axis at $1,000 then it is assumed that the
*
total fixed costs
*
for a month are $1,000.

*
b
*
is the 游戏电竞线上外围APP v5.2 estimated
*
variable cost
per unit
*
of
*
x
*
. It determines the
*
slope
*
of the total cost line. If
*
b
*
is $5, this means that the variable cost portion of electricity is estimated to be $5 for every unit of
*
x
*
.

*
x
*
is the 游戏电竞线上外围APP v5.2
*
independent
*
variable. For example,
*
x
*
could represent the known number of machine hours used in the month.

*
bx
*
is the 游戏电竞线上外围APP v5.2
*
total variable cost of electricity
*
. If the company's electricity cost is estimated to be $5 per unit of
*
x
*
, and
*
x
*
is 4,000 machine hours, then the
*
total variable cost of electricity
*
for the month is estimated to be $20,000.

In our example the total estimated cost of electricity (
*
y
*
) in a month when
*
x
*
is 4,000 machine hours will be $21,000.