Idiot\'s Guides Basic Math and Pre-Algebra

306 Appendix A

6. x + y = 7


7. 2x – y = 3
   8. y = 3x – 6
   9. y = 8 – 2x

-6 -2 062

-2

2

4

6

-4

-6

-8-9 -7 -5-4 -1-3 134 5 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

-10 10

-10

10

y

x

-6 -2 062

-2

2

4

6

-4

-6

-8-9 -7 -5-4 -1-3 134 5 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

-10 10

-10

10

y

x

-6 -2 062

-2

2

4

6

-4

-6

-8-9 -7 -5-4 -1-3 1345 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

-10 10

-10

10

y

x

-6 -2 062

-2

2

4

6

-4

-6

-8-9 -7 -5-4 -1-3 1345 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

-10 10

-10

10

y

x