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4 years ago

For which system of inequalities is (3,-7) a solution?

Mathematics

1 answer:

ElenaW [278]4 years ago

7 0

Answer:

D) x + y ≤ -4

3x + 2y ≤ -5

Step-by-step explanation:

Step(i):-

we will choose the system of inequalities

x + y ≤ -4

3x + 2y ≤ -5

x + y = -4 ...(i)

3x + 2y = -5..(ii)

Multiply equation (i) with '3'

3x + 3y = -12

3x + 2 y = -5

- - +

0 + y = -7

Step(ii):-

Substitute y = -7 in equation (i)

x + y = -4

x - 7 = -4

x = -4 + 7

x = 3

The solution of the given inequalities is ( 3, -7)

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3 years ago

What is the rule? 100 cm 1 m, 250 cm ? M, 1500 cm ? M

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3 years ago

A light bulb consumes 1440 watt-hours per day. How many watt-hours does it consume in 4 days and 18 hours.

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Answer:

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Step-by-step explanation:

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3 years ago

A car travels at constant speed for 7 days and covers 1500 miles. What is the speed in centimeters/minute? You may use the (appr

zvonat [6]

Answer:

Speed = 23809.52 cm/min

Step-by-step explanation:

Given : A car travels at constant speed for 7 days and covers 1500 miles.

To find : What is the speed in centimeters/minute

Solution : Formula to find speed is

$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$

Distance traveled = 1500 miles and time taken = 7 days

$\text{Speed}=\frac{\text{1500 miles}}{\text{7 days}}$

Now, we have to convert miles into centimeter and days into minutes.

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1 hour= 60 minute

24 hr= 24×60 minute

1 day = 24×60 minute

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1.6 km = 1.6 × 100000 cm

1 mile = 1.6 × 100000 cm

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Put back the values into speed

$\text{Speed}=\frac{\text{1500 miles}}{\text{7 days}}$

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$\text{Speed}=\text{23809.523 cm/minute}$

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3 years ago

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Step-by-step explanation:

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