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HACTEHA [7]
3 years ago
15

Given: x + y = 15.

Mathematics
1 answer:
Tomtit [17]3 years ago
8 0
What you do is: PLUG IT IN!! (children clapping).

Lets plug in -3. When we plug in -3 for x, we would need to add it to 15. So that means

-3+y=15
y=18.

It shows that the ordered pair is actually (-3,18). So A and B are wrong. Now lets check out C. Lets plug in 16 for x and see what happens.

16+y=15
y=-1

Wow, it looks like the ordered pari for 16 would be (16,-1). So it looks like all your choices are wrong. Wow. But, from what I see, these ordered pair work:

(0,15)   (15,0)
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Question 2 (1 point)
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Answer:

(2,4)

Step-by-step explanation:

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Step-by-step explanation:

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boyakko [2]

Answer:

If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool

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A drain pipe can empty the pool in 21 hours

Drain pipe 1 hour work =\frac{1}{21}

Inlet pipe and drain pipe 1 hour together work = \frac{1}{20}-\frac{1}{21}=\frac{1}{420}

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So, they can fill 1/3 in hours = \frac{1}{\frac{1}{420}} \times \frac{1}{3} =140 hours

Hence If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool

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