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3 years ago

Find the value of y when x equals 1, 9x+7y=-12

Mathematics

1 answer:

SpyIntel [72]3 years ago

3 0

9(1)+7y=-12
9+7y=-12
7y=-12-9
7y=-21
y=-3

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wel

Answer:

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Step-by-step explanation:

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3 years ago

If the discriminant is 16 in a quadratic equation what is true about its solutions

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3 years ago

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Gnoma [55]

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A total of $6000 was invested, part of it at 3% interest and the remainder at 8%. If the total yearly interest amounted to $380,

Nastasia [14]

$ 2000 is invested at 3 % interest and $ 4000 is invested at 8 % interest

Solution:

Given that, total of $6000 was invested

Let "x" be the amount invested at 3 % interest

Then, (6000 - x) is the amount invested at 8 % interest

Given that,

The total yearly interest amounted to $380

Then, we can frame a equation as:

$x \times 3 \% + (6000 - x) \times 8 \% = 380$

Solve the above expression for "x"

$x \times \frac{3}{100} + (6000-x) \times \frac{8}{100} = 380\\\\0.03x + (6000-x) \times 0.08 = 380\\\\0.03x + 480 - 0.08x = 380\\\\-0.05x = -100\\\\\text{Divide both sides by -0.05 }\\\\x = 2000$

Thus, $ 2000 is invested at 3 % interest

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$ 4000 is invested at 8 % interest

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4 years ago