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zaharov [31]
2 years ago
10

Make sure to show your work.

Mathematics
2 answers:
amm18122 years ago
8 0

(1,-3)

Step-by-step explanation:

6x-9= -3x ---} -9=-9x ---} -9/-9= x ---} 1=x

6•1-9= -3•1 ---} 6-9= -3 ---} -3= -3 ---} -3=y

andrew-mc [135]2 years ago
5 0

Answer:

( 1, -3 )

Step-by-step explanation:

6x - 9 = y \\ y =  - 3x \\  \\ 6x - 9 =  - 3x \\ 6x + 3x = 9 \\ 9x = 9 \\ x = 1 \\  \\ y =  - 3x \\ y =  - 3(1) \\ y =  - 3

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The currency in Peru is the Nuevo Sole. The exchange rate is approximately $1 = 3 Nuevo Soles. At this rate, how many dollars wo
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3 years ago
Braving blizzard conditions on the planet Hoth, Luke Skywalker sets out at top speed in his snowspeeder for a rebel base 4800 mi
____ [38]

Answer:

v_top = 2400 mi/hr

v_w = 400 mi/h

Step-by-step explanation:

Given:

- Total distance D = 4800 mi

- Headwind journey time taken t_up= 3 hr

- Tailwind journey time taken t_down = 2 hr

Find:

Find the top speed of Luke's snow speeder and the speed of the wind.

Solution:

- The speed of Luke v_l is in stationary frame is given by:

                           v_l = v_w + v_l/w

Where,

           v_w: Wind speed

           v_l/w: Luke speed relative to wind.

- The top speed is attained on his returned journey with tail wind. We will use distance time relationship to calculate as follows:

                         v_top = D / t_down

                         v_top = 4800 / 2

                        v_top = v_down = 2400 mi/hr

- Similarly his speed on his journey up with head wind was v_up:

                         v_up = D / t_up

                         v_up = 4800 / 3

                        v_up = 1600 mi/hr    

- Now use the frame relations to find the wind speed v_w:

                         v_down = v_w + v_l/w

                         v_up = -v_w + v_l/w    

- Solve equations simultaneously:

                         2400 =  v_w + v_l/w

                         1600 =  -v_w + v_l/w

                         4000 = 2*v_l/w

                         v_l/w = 2000 mi/h

                         v_w = 400 mi/h

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