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umka21 [38]
3 years ago
13

5x+2y=-4 -x+2y=8 Solve the system

Mathematics
1 answer:
maria [59]3 years ago
6 0
Subtract the second equation from the first.
.. (5x +2y) -(-x +2y) = (-4) -(8)
.. 6x = -12
.. x = -2

.. -(-2) +2y = 8
.. 2y = 6
.. y = 3

The solution is (x, y) = (-2, 3).

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The price of commodity a is 4500 and increases at the rate of $6 every three months. Commodity b costs $5400 and increases at ra
ivanzaharov [21]
Let x be the months and y be the cost.

Rate of increase of commodity A = 6/3 = $2 per month
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Equating the costs,
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