agenda review quiz 8 groupwork - mcccporterr/course/135/documents/135week9..pdf · 135 week...
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135 week 9..notebook March 22, 2017
Agenda
Review Quiz 8
Lecture Solving Rational Equations
Groupwork
Quiz #8
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135 week 9..notebook March 22, 2017
LCD: 4(y5) 4(y5)
4(y5)
4(y5) (y8)
8(y5) + 8==3y 12
8y 32
=3(y4)
8(y4)= 3
8
Lecture Solving Rational Equations
possibilities:
no solutioncontradiction
all solutions identity
some solutions
condition
135 week 9..notebook March 22, 2017
Find LCD: 2424 24
32 = 3u + 66 6
26 = 3u
26/3 = u
135 week 9..notebook March 22, 2017
5(v2)
35 = 2 + 2* 5 *(v2)
35 = 2 +10(v2)
35 = 2 + 10v 20
35 = 22 + 10v
+22 +22
57 = 10v
57/10 = v
5(v2)
v2 5(v2)v2 1 5
= 5.7 answer doesnt make 5(v2) = 0
LCD: x(x4)
22x = 11(x4)
22x = 11x 44
11x = 44
x = 4
135 week 9..notebook March 22, 2017
lcd: yy y
2 = 8y
1/4 = y
LCD: 4x
4x 4x
7x = 24 8x8x 8x
15x = 24
x = 24/15 = 8/5
answer doesnt make LCD = 0, so its good
135 week 9..notebook March 22, 2017
15u 15u 15u
21 + 10 = 15u
31 = 15u
31/15 = u
2(x4)
LCD: 2(x4)
2(x4)
6 = 5 + 2(x4)
6 = 5 + 2x 8
6 = 13 + 2x
13 13
7 = 2x
x = 7/2
135 week 9..notebook March 22, 2017
(v 4) ( v 2)
(v 4) ( v 2)(v 4) ( v 2)
(v 4) ( v 2)
8 = v 2 + 5(v 4)
8 = v 2 + 5v 20
8 = 6v 22
22 22
30 = 6v
v = 5 does make LCD = 0
LCD: (v 4)(v2)
135 week 9..notebook March 22, 2017
14
(v3)(v+3)
(v3)(v+3)(v3)(v+3)(v3)(v+3)
6v2 = 9(v+3) + 7v (v3)
6v2 = 9v + 27 + 7v2 21v
0 = v2 12v + 27
(v9) (v3)
v = 9, NOT 3, because it make LCD=0
LCD: pr
prpr
prs = 9r + 5p5p 5p
prs 5p = 9r
p(rs 5) = 9r
p = 9r / (rs5)
135 week 9..notebook March 22, 2017
3mi
28min= xmi
42min
28 427 4 622 3
LCD=84
84 84
9 = 2x
x = 9 / 2 or 4.5
Applications of solving rational equations
200 mi
9 gal= 420 mi
x gal
x = 420 *9 / 200
18.9 gallons
135 week 9..notebook March 22, 2017
time rate amount
t1pool
160min
t pools
160
t1pool
240
t pools
240
p1
p2
1t + t = 1
160 240 LCD:
160 240802 3
480480
3t + 2t = 480
5t = 480
t= 480/5 = 96 minutes
time rate distance
up t 9 r 10mi
down t 9 + r 20mi
t * (9r) = 10
t (9 + r) = 20
t = 10 / ( 9r)
t = 20 / ( 9 + r)
10 = 20
9r 9+ r
10 ( 9 + r) = 20 ( 9 r)
90 + 10r = 180 20 r
90 +20r 90 + 20r
30 r = 90
r = 3
135 week 9..notebook March 22, 2017
x+ y=150
.7x + .95y = .8(150)
.7x + .95y = 120
x + y = 150
.7x + .7y = 105
.25y = 15
y = 15 / .25 = 60
x+ 60 = 150
x = 90
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Group Work
135 week 9..notebook March 22, 2017
x=3,5
135 week 9..notebook March 22, 2017
135 week 9..notebook March 22, 2017
Answers