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3 years ago

15

Given: x + y = 15.

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:

Equation 1:

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x=-y+6

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Step-by-step explanation:

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An inlet pipe on a swimming pool can be used to fill the pool in 2020 hours. The drain pipe can be used to empty the pool in 212

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

Step-by-step explanation:

An inlet pipe can fill the pool in hours = 20

Inlet pipe 1 hour work = $\frac{1}{20}$

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 = $\frac{1}{20}-\frac{1}{21}=\frac{1}{420}$

Now we are given that the pool is 2/3 filled

So, remaining portion to be filled = $1 - \frac{2}{3} = \frac{1}{3}$

So, Inlet pipe and drain pipe fill $\frac{1}{420}$ in hours = 1

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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