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Inessa05 [86]
3 years ago
12

Use elimination to solve the system of equations given by -7x + 3y = 14 and 7x - 2y = -14.

Mathematics
1 answer:
Bogdan [553]3 years ago
4 0

The coefficients of x are already opposites, so you can simply add the two equations to eliminate x.

... (-7x +3y) + (7x -2y) = (14) + (-14)

... y = 0 . . . . . . . simplify

... -7x + 3·0 = 14  . . . . substitute the value of x into the first equation

.. x = 14/(-7) = -2

The solution is (x, y) = (-2, 0).

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3 years ago
If P is directly proportional to Q. And Q = 30 when P = 40. Find Q when P = 70
Leni [432]

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Q = 52.5

Step-by-step explanation:

given P is directly proportional to Q then the equation relating them is

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