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3 years ago

How do you SOLVE SYSTEMS OF LINEAR EQUATIONS BY SUBSTITUTION!!!!!!

1 answer:

6 0

Ex: y=2x+4 <span>3x+y=9 <--Simply plug y into the second equation here and solve for x. When you find the solution for x, you can plug the solution to x into the 2nd equation to find y....Hope this helps!!!</span>

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Flying with the wind a plane went 198 mph. Flying into the same wind the plane only went 162 mph. Find the speed of the plane in

olganol [36]

Answer: speed of plane in still air is 180 miles per hour

speed of the wind is 18 miles per hour

Step-by-step explanation:

Flying with the wind, the plane went 198 miles per hour. This means if was flying in the same direction with the wind. This is same as the speed in still air because there was no opposition from the wind.

Flying into the same wind the plane only went 162 mph. This means that the plane flew against the wind

Let x = the speed of the plane

Let y = the speed of the wind

when flying with the wind,

x + y = 198 - - - - - - -1

When flying against the wind,

x - y = 162 - - - - - - - -2

Subtracting equation 2 from equation 1,

y - - y = 198 - 162

2y = 36

y = 36/2 = 18 miles per hour

x = 198 - y = 198 -18

x = 180 miles per hour

4 0

3 years ago

Farmer Ed has 150 meters of fencing and wants to enclose a rectangular play that borders a river. If farmer Ed does not fence in

dexar [7]

150/3=50

50^2=2500m^2=largest area

7 0

3 years ago

Read 2 more answers

6.) What is the similarity ratio?<br> A. 10:20<br> B. 10:28<br> (C.)5:14<br> D. 1:2

lesya692 [45]

Answer:

A AND D

B AND C

Step-by-step explanation:

If you change A into lowest terms it equals D

and if you cjange B into lowest terms it would equals C

5 0

3 years ago

10 men working for 6 days can complete 5 copies of a book if there are 8 men working to complete 4 copies of the book how many d

Musya8 [376]

Answer:

6 Days

Step-by-step explanation:

Practically:

It takes,

10 Men ( complete ) 5 Copies --> 6 Days

So, 2 Men can complete 1 copy in 6 days.

Question asks us :

8 Men ( complete ) 4 Copies --> X Days

It will take 6 days because the proportion of men to copies is same as the first equation.

Theoretically:

10 Men 5 Copies 6 Days

8 Men 4 Copies X Days

> 6/X = 8/10 ( If men decrease the number of days increase. So, it is an indirect proportion. ) . 5/4 ( If copies decrease the number of days decrease as well. So, it is a direct proportion. )

> 6/X = 8/10 . 5/4

> 6/X = 40/40

> 6/X = 1

<h2>> X=6</h2><h2></h2><h2><em>I hope it will be understood.</em></h2><h2><em>If I have any inaccuracies please let me know.</em></h2><h2><em>Have a nice day and never stop questioning!</em></h2><h3><em></em></h3>

6 0

3 years ago

Read 2 more answers

A can holds 4 golf balls. The diameter of each golf ball is 5 cm. What is the volume of the empty space inside the can?

forsale [732]

Answer:

Volume of the empty space in the can is 327.05 $cm^3$