Date
Name
Practiee B
Far use with pages 302-308
Write an equation in point-slope form of the line that passes through the
given point and has the given slope m.
m: -3
4. (-2, -8); m:3
1.
7.
(1,9);
(6, -4);
*:;
')
2- (4,-10);m:2
5. (-4,
8.
-7);
* : -)
(0, 15); m:
L
i
3.
(-5,6);
m: 4
6- (-9,2);m: -5
e.
(-8,0);
m:2
2:
-4{x
Graph the equation.
11. y+t:2(x-5)
10. y-6:3(r-4)
13. y+2:
1)
a4,
t.
Y: rlx -
* ,1
17.
y-2:-|dr-z)
-(x-
J)
12. y -
15-
* 3)
y*3:5x
=
o
a
E
o
(..]
.E
E
=
o
o
=
o
-!
c
.o
E
o
6
=
6
o
=
ooo
!
(9
E
5
'=
a
16. y
+ | :'1t,
t8. y++.:2(x-r)
Date
Name
Practicg B
continued
Far use v,tith pages 302-3*8
Write an equation of the line shown.
zfj.
19.
Write an equation af the line that passes through the given points.
26, {-3, n}, {4.21
25. {9,4), {17,6>
27.
(3, -8), t7,
-2)
2a. {-4. -4
,
C
6
(2,5)
o
E
O
C-)
zg.
30.
Bryee Canyon National Park Fram 1990 to 2000, the number of thousand visits
by people to Bryce Canyon National Park ircreased by about 23.9 thousand visits
per year. ki 2000, there rn'ere about 1102.4 thousand visits to the park.
a. Write an equation that gives the nrimber olthousand visits as a functio* of the
number of years since i990.
b. How many visits were made to the palk in t995?
Airmail Letter Rates The table shows
ihe cost olmailing different r.veights of
airmail letters to Canada in 2005.
Z
0.8s
1
J
1.1S
=CO
o
=
O
=o
c
.O
.=
E
4
1.35
8
7.35
o
.=
J
c
=
aO
b.
Explain u'hy the situation can be modeled *siag a linear equation.
Write an equaticn that gives the cost (in dollars) as a function olthe weight of an
@
c.
airmaii letter iin aunces).
Hcw much does it cost to mail a S-cunce airmail letter to Canada?
a.
3I.
.C
New Mexico The population density of New Mexico iacreased at a relatively constant
rate flom i980 to 1999. In 1985, the populatioa density was about 11.62 people per
square mile. h 1999, the population densiry was about i4.28 peopie per square miie.
tr\irite an equation that gives the populatioa density (in peopie per square mile) as a
function of the number of years since 1980. What was the populaticn de*sity in 1990?
!
s
'=
q
o
Name
Date
Write two eguations in standard form that are equivalent to the
given equation.
1. 6x * 24Y: l$
4. -4r - 2y: 16
25.
8x
- l4y:2
3. 6:-i-y:1
5. -9x * 4y:
Lr + 3Y:17
5
Write an equation in standard form of the line that passes through the
given point and has the given slope rn,
7,
(4,3),
10. (-7,
m:'/
8), m
8. (5,-1),m:2
: -3
tI.
(9, -10), m
9. (-2,
: -4
6), m
:
1
12, (-15, -4),m:
Write an equation in standard form of the line that passes through the
given points.
13.
16.
(2,6), (3, 8)
14. (-1.2).
(5.4)
(3, -8), (5,
't7. (-5,6),
(2.
-9)
15. t7 , -3), {4, 1)
18, {-3, -1), (6, -g)
-3)
Write equations of the horizontal a*d the vertical lines that pass through
the given point.
19. (8,3)
22,
ZOt.
(-2.5)
Text ll{ess*ging Your celi phone p}a:r charges you
S.02 to send a text message and S.07 {o receive a text
message. You pian lo spend $c more than 55 a month
21. (5, -5)
6,1
S- loo
EE
q >
E
G
J
J5
oa text messaging.
O
(-)
FE
Ec
.=
a.
X'E
F
b.
c.
Write an equatio* in standard form that models
the possible combinations of sent text messages
and received text messages.
U
E
0
50 100 150 28A 25Aa
Text messages sent
Graph the equation from pa* {a}. Etplain u,hat
the intercepts of the ,eraph meaa in this situation.
.!)
E
e
o)
own potting soil mix of
sphagnum peat moss and coarse sand. You buy the peat ftoss in bags thx weigh
approximately 2 pounds.
The last time you made potting soil, you Esed 9 bags of spha,qrum peat moss
and 4 bags of coarse sand. Use this information to find the number of pounds
in a bag cfcoarse sand.
an equation
it standard form that models the pcssible
combinations
of
bags ofsphagnum peat moss and coarse sand you can use.
e.
o
O
E
List three other possible combinations of rhe number
of messages you cart send and receive.
b. Write
=of
.9
23. Potfing SoiI Mix You are making 24 pounds olyour
a.
=oc
I-ist three possible combinations of whoie bags of sphagnum peal moss and
coarse sand you can use to make the potting soil.
.=
J
6o
=
o
Eo
s>
@
s
5
a
O