04-09-2017
Mathematics

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04-09-2017

- 9y + 6x = 7 (a)
+9y - 8x = 9 (b)

Add a) + b)
- 9y + 6x = 7 (a)
+9y - 8x = 9 (b)
----------- -------
0y - 2x = 16
Solve for x:
-2x = 16
2x = -16
x = - 8.
Now replace x = 8 in either a) or b) and you will find y = -55/9

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