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Sati [7]
2 years ago
12

X + 9y = 8 x − 4y = –18

Mathematics
1 answer:
loris [4]2 years ago
5 0

Step-by-step explanation:

x + 9y =  - 18 \\ 8x - 4y =  - 18 \\ x =  - 18 - 9y \\ 8( - 18 - 9y) - 4y =  - 18 \\  - 144 - 72y - 4y =  - 18 \\  - 76y = 126 \\ y =  - 1.66 \\

x =  - 18 - 9y \\ x =  - 18 - 9( - 1.66) \\ x =  - 18 + 14.94 \\ x =  - 3.06

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