Answer:
1) x = - 4.67, y = 9.67
2) x = 1 , y = 5
Explanation:
- rearrange + substitute:
- 4y = 20 - 4x 5 - x = -23 - 7x
- y = 5 - x 7x - x = -23 - 5
- y = -23 - 7x 6x = -28
- x = - 4.67
- y = 5 - ( - 4.67) = 5 + 4.67 = 9.67
2. substitute:
-4x + 9 = 8x - 3 y = 8 - 3
9 + 3 = 8x + 4x y = 5
12 = 12x
1 = x
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