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2 years ago

−9x+4y=6 9x+5y=−33

Mathematics

1 answer:

koban [17]2 years ago

8 0

For the first one x=2 and y=6
for the second one if you can use fractions x=-1/3 and y=6

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Answer:

1.1l

Step-by-step explanation:

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2 years ago

What is the ratio of 7:21:35?

Marysya12 [62]

Answer:

Step-by-step explanation:

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2 years ago

In the air, it had an average speed of 16 m/s In the water, it had an average speed of 3 m/s before hitting the seabed. The tota

julia-pushkina [17]

<h2>The stone fall in air for 7 seconds and fall in water for 5 seconds.</h2>

Step-by-step explanation:

Total distance to sea bed = 127 m

Let the distance traveled in air be s.

Distance traveled in water = 127 - s

Average velocity in air = 16 m/s

Average velocity in water = 3 m/s

Distance traveled in air = Average velocity in air x Time in air

s = 16 x t₁

$t_1=\frac{s}{16}$

Distance traveled in water = Average velocity in water x Time in water

127-s = 3 x t₂

$t_2=\frac{127-s}{3}$

We have total time is 12 seconds

That is

t₁ + t₂ = 12

$\frac{s}{16}+\frac{127-s}{3}=12\\\\3s+2032-16s=576\\\\13s=1456\\\\s=112m$

We have

s = 16 x t₁

112 = 16 x t₁

t₁ = 7 s

t₁ + t₂ = 12

7 + t₂ = 12

t₂ = 5 s

The stone fall in air for 7 seconds and fall in water for 5 seconds.

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2 years ago

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2 years ago

−9x+4y=6 ​ 9x+5y=−33 ​​

−9x+4y=6 9x+5y=−33