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3 years ago

How many solutions do each of these systems have ?

Mathematics

1 answer:

Zanzabum3 years ago

4 0

Answer:

1. C

2. A

3. D

Step-by-step explanation:

1. The equations will have the same exact line. This is infinite solutions.

-3x + 4y = -20 converts to y = 3/4x - 5

2. To solve the system, substitute y = 2x - 3 into the equation x + 4y = 6.

x + 4(2x-3) = 6

x + 8x - 12 = 6

9x - 12 = 6

9x = 18

x = 2

This system has one solution.

3. The equations will have the same slope. This means no solution is possible.

6x + 3y = -12 converts to y = -2x - 4

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3 years ago

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

9) Craig earns the same amount

Sloan [31]

Answer:

Craig earns $1,200 each month

Explanation:

We are given that Craig pays a total of $720 each year for his telephone service

We also know that a year has 12 months

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Craig pays $\frac{720}{12}= 60$ dollars each month for his telephone services

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Hope this helps :)

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4 years ago