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solving using the addition method x-2y=7 3x+2y=5?
6 Answers
- 6 years ago
You can see that you have -2y and 2y in both equations so that when you add them both together you'll get 0 allowing you to just have x so...
(1) 3x + 2y = 5
(2) x - 2y = 7
(1) + (2) would give:
4x = 12
x = 3
Now sub 3 into either (1) or (2), lets do (2):
9 + 2y = 5
2y = -4
y = -2
- Anonymous6 years ago
Solving using the addition method
x-2y=7
3x+2y=5
4x = 12
x = 3
can you find y ?? Why not ? You can try ! Check your answers...
[(3, - 2) ]
- 6 years ago
By addition method we have,
x-2y=7
3x+2y=5
________
4x = 12
i.e., x = 12/4 = 3
we also have,
x-2y=7
i.e., 3-2y=7 (as x = 3)
i.e., -2y = 7-3
i.e., -2y = 4
i.e., y = -2
Hence, we have x=3 and y=-2.
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