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Solving Equations
Number of Solutions
Value of y, when x = 4
Express x in terms of y
Problem Solving
100

5x - 2 = 2x + 7

x = 3

100

x + 6 = 11

one solution, x = 5

100

p.126 #13

4x - 2 = y + 5

y = 9

100

p.126 #19

4x + y = 2(x + 3y)

x = 5/2 y

100

p.127 #25

The perimeter of one quadrant of pizza is 25 inches.

200

p.126 #1

2(x - 5) - 8 = 20

x = 19
200

p.126 #9

no solution

200

p.126 #14

x - 4y = 2

y = 1/2

200

p.126 #20

3(x - 2y) = 4x + 5y

x = -11y

200

p.127 #26

The red section is 4.2 feet tall.

300

p.126 #2

2x - (5 - x) = 5/2

x = 5/2 (or 2.5)

300

p.126 #10

6y + (16 - 2y) = 4(4 + y)

infinite solutions

300

p.126 #15

y = 10

300

p.126 #21

x = 6 - 5/2 y

300

p.127 #27a

4(1.25p) + 5p = 10p

400

p.126 #3

1/4(x + 2) - 2 = 0.5

x = 8

400

p.126 #11

4x + 5 = 2x - 7

one solution, x = -6

400

p.126 #16

y = 15

400

p.126 #23

0.25(x + y) = 15 - x

x = 12 - 0.2y

400

p.127 #29a

M = 25 + 0.04t

500

p.126 #4

x = 8/22 (or 4/11, or 0.36 repeating)

500

p.126 #12

infinite solutions

500

p.126 #18

y = 31/3 (or about 10.3)

500

p.126 #24

x = -17.5 + 0.75y

500

p.127 #29c

Jake's usage time was 10 hours in November.