3. x = 3 (think!)
6
4. 3y - 6x = 9 (careful!)
7
5. 6x + 3y = 15
8
6. y = -5 (think!)
9
7. y = x + 5 with a domain of {x %u2265 -4} (careful!)
10
8. 9y - 18x = -27
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9. 1/4 x - 2y = -2 with domain of {x < 0}
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