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See the attached file.
Solve each system by the substitution method:

1. x = 9 - 2y
x + 2y = 13

2. 6x + 2y = 7
y = 2 - 3x

3. y = 3x -5
21x - 35 = 7y

4. 9x - 3y = 12
y = 3x - 4

5. 3x - 2y = -5
4x + y = 8

6. 2x + 5y = -4
3x - y = 11.

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