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Depdendent Variable

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Equ. #1:

Equ. #2:

Equ. #3:

Equ. #4:

Equ. #5:

Equ. #6:

Equ. #7:

Equ. #8:

Equ. #9:

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Dependent Variable

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Ineq. #1:

Ineq. #2:

Ineq. #3:

Ineq. #4:

Ineq. #5:

Ineq. #6:

Ineq. #7:

Ineq. #8:

Ineq. #9:

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Linear Equations

1. [2 Points] Write the slope-intercept form of the equation of the line through the point
(5,−1) that is parallel to the line through the points (-3, 8) and (7, 4).

ANS: __________

2. [3 Points] The sales of a small software company are a linear function of time. Sales
were $120,000 in 1999 and $180,000 in 2003. If the linear trend continues, in which year
will the annual sales reach $240,000?

ANS: __________

3. [5 Points] Only four of the following five points are on the same line. Which point is
not on the line determined by the other four?

ANS: __________

1. [2 Points] Write the slope-intercept form of the equation of the line through the point
(5,−1) that is parallel to the line through the points (-3, 8) and (7, 4).

Solution:	Slope of line between (-3, 8) and (7, 4)	The point-slope equation of the line through (5,−1) is

ANS:

2. [3 Points] The sales of a small software company are a linear function of time. Sales were
$120,000 in 1999 and $180,000 in 2003. If the linear trend continues, in which year will the
annual sales reach $240,000?

Solution:

Points: and

Answer:

ANS: 2007

3. [5 Points] Only four of the following five points are on the same line. Which point is not
on the line determined by the other four?

Solution: First, make all y values have the same denominator (2110). Now, ignore
denominators (easier) and find the slope between any one (fixed) point and each of the rest. We
select. If all slopes are different we toss. If only one slope is different
from the remaining slopes, toss the point which determines the different slope with.
ANS: