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g100num [7]
3 years ago
13

How do I solve system of equations elimination method ​

Mathematics
1 answer:
alexandr1967 [171]3 years ago
7 0

Answer:

In the elimination method you either add or subtract the equations to get an equation in one variable. When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.

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Prove the identity sin4x=2sin2xcos2x
Musya8 [376]
There is a trig identity called the sum of 2 angles for sin its<span>
sin(a+b)=sin(a)cos(b)+cos(a)(sin(b)
</span>
You will need to use it. So in your question split the 4x in 2 equal parts 2x and 2x
 <span>
</span><span>sin(4x)=sin(2x+2x)

</span>Now using the expansion above you will get

<span>sin(2x+2x)=sin(2x)×cos(2x)+cos(2x)×sin(2x)

</span>And it will simplify to 

<span><span>2sin(2x)cos(2x)

I hope this helps you! Good luck :)</span></span>
5 0
3 years ago
Read 2 more answers
What is 2+2 pls help
Alexandra [31]

Answer:

4

Step-by-step explanation:

2 + 2 += 4

This can be solved by addition.

7 0
2 years ago
Square root of 20<br> O Between 5 and 6<br> O Between 4 and 5<br> O Between 3 and 4<br> 0 4
marta [7]

Answer:

B. It is between 4 and 5

Step-by-step explanation:

When you square 4 you get 16. Do the same to 5 and you get 25.

7 0
3 years ago
Johnathan bought 10b of flour at $7.50. He had a store coupon for $0.79 what was the final price for the flour
tatuchka [14]

Answer:

10b= 7.50

7.50-.79=6.71

Step-by-step explanation:

4 0
3 years ago
Certain hot water bottles hold up to 1500 milliliters of water. how many liters are in 1500 milliliters
ArbitrLikvidat [17]
<span>1,500 milliliters is equal to 1.5 liters. In the metric system, a liter is the basic unit of volume for liquids. Like the rest of the metric system, the naming system uses prefixes derived from Latin and Greek roots that tell the user what fraction or multiplier the unit uses. In this example, "milia" is "thousand" in Latin. Thus, a "milli-liter" is a thousandth of a liter. Learning these prefixes makes the use of the metric system much easier.</span>
8 0
3 years ago
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