Mid-Chapter Quiz MafhXL for School^
p' Go to PowerAlgebra.com>Do y o u k n o w H OW?
Each rate of change is constant. Find the rate of change
and explain what it means.Write an equation in slope-intercept form of each line.- Studying fo r a Test
m- Distance a Car Travels
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6 87
7 89
(^891)
Find the slope of the line that passes through each pair
of points.
- (7,3), (5 , 1 )
- (6, - 4 ) , (6, 6)
4. ( - 2 , 1 ) , (3, 6)
6. (2, 5), ( - 8 , 5)
Tell whether each equation is a direct variation. If it is,
find the constant of variation.- y = 3x
- 5x + 3 = 8y + 3
- —3x - 35y = 14
Find the slope and y-intercept of the graph of each equation.
- y = fx + 3
- 3x+4y= 12
- 6y = —8x — 18
- Credit Cards In 2000, people charged $1,243 billion
on the four m ost-used types of credit cards. In 2005,
people charged $1,838 billion on these sam e four
types of credit cards. W hat was th e rate of change? - Bicycling The distance a w heel m oves forward
varies directly w ith the n u m b e r of rotations. Suppose
the w heel m oves 56 ft in 8 rotations. W hat distance
does the w heel move in 20 rotations?
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(^6150)
9 225
12 300
Graph each equation.
- y = 4x-3
- y + 3 = |(x+2)
Write an equation in point-slope form for the line
through the given point and with the given slope m.- ( 2 , -2y,m = - \
- (4, 0); m = 4
Write an equation of the line that passes through each
pair of points.- ( 4 , - 2 ) an d (8, - 6 )
- (-1,-5) and (2,10)
Do y o u UN DERSTAND?
- W riting D escribe two m eth o d s you can use to write
an e q u a tio n of a line given its graph. - Vocabulary H ow can you find the y-intercept of the
graph of a linear equation? - Reasoning C an you g raph a line if its slope is
undefined? Explain. - Busi ness A salesperson earns $18 p er h o u r plus a
$75 b o n u s for m eeting h e r sales quota. Write an d
graph an eq u a tio n th a t represents h er total earnings,
including h e r bonus. W hat does th e in d ep en d e n t
variable represent? W hat does th e d ep e n d e n t
variable represent?