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Andrew [12]
3 years ago
9

Solve the equation using elimination. Write your answer as an ordered pair.

Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0

Answer:

(-3, 1).

Step-by-step explanation:

2x + 7y =  1        -------------(A)

x + 5y  =  2       Multiply this by -2:

-2x - 10y = -4    Add this equation to equation (A):

0 - 3y = -3

3y = 3

y = 1.

Substitute this in equation (A):

2x + 7(1) = 1

2x = -6

x = -3.

Check if these 2 values are correct in the second equation:

-3 + 5(1) = 2

2 = 2.

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A person invest $1200 in an account that earns 2% interest compound quarterly. Find when the value of the investment reaches $15
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Answer:

After 11 years the value of the investment reaches $1500.00

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Step-by-step explanation:

The formula used for finding time (when the value reaches certain amount) is:

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The rule of logarithm says that the exponent can be multiplied with the base when taking log

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