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3 years ago

Solve each system by elimination 9x - 6y = -21 and -9x + 9y = 18

Mathematics

2 answers:

IrinaK [193]3 years ago

7 0

Answer:

X= -3, Y= -1

Step-by-step explanation:

loris [4]3 years ago

6 0

<h2>Answer</h2>

= {x, y}

= {-1.-3}

X = -1

Y = -3

<h2>Explain</h2>

Look at the picture :)

#LearnWithBrainly

<h3>gak bisa bahasa inggris</h3>

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A salsa recipe uses green pepper, onion, and tomato in the extended ration 1 : 3 : 9. How many cups of onion are needed to make

Elanso [62]

Let x be a variable.

Using the ratio and the given number of 117, we can create the following formula:

1x + 3x + 9x = 117, where 3x is the cups of onion

Simplify this equation.

13x = 117

Divide both sides by 13

x = 9

We want to solve for 3x, so multiply both sides by 3

3x = 27

As I started earlier, 3x is how many cups of onions is needed; thus, 27 is our answer. Hope this helps! :)

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3 years ago

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Need help simple explanation if possible

photoshop1234 [79]

Answer:

m < A = 60º

m < B = 30º

Step-by-step explanation:

The given sides on this triangle are: 6, $6\sqrt{3}$ , and 12

Any triangle with the angles of 30º - 60º - 90º always has side lengths in this proportion:

x, $x\sqrt{3}$ , 2x

We can line this up with the given sides. If x is 6, then 2x would be 12.

x : $x\sqrt{3}$ : 2x = 6 : $6\sqrt{3}$ : 12

Angle B is across from 6, the shortest side. That also means that it corresponds to x, or the smallest angle in the proportion, 30º.

m < B = 30º

Solving for < A:

Method 1) Sum of Angles in a Triangle

Since we already know that one angle is right and therefore 90º and m < B is 30º, we can subtract these from the total sum of angle measures in a triangle to get the last angle, < A.

180º - 90º - 30º = 60º

m < A = 60º

Method 2) Using the second part of the proportion

Since m < A is across from the second largest side, we know that it is equal to $x\sqrt{3}$ ( $6\sqrt{3}$ in this question) or 60º in the angle proportion.

This means that m < A = 60º

Let me know if you have any questions!

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2 years ago

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NNADVOKAT [17]

Answer: (4.9x) - 3

Step-by-step explanation: the reason i didn't add an extra line thing is because the negative becomes the minus. the 4.9 is self evident

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3 years ago

Plsss help will mark brainliest

DiKsa [7]

C, because 7 divided, or over nine, is 7/9
Hope this helps!

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3 years ago

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Audrey's parents give her $5 to play video games at the mall.Each games costs a quarter to play.which choice is NOT a correct me

Paraphin [41]

D. take the number of dollars she has and multiply by .25.

dividing by a number is the same as multiplying by it's reciprocal. since she is dividing by .25, she needs to multiply by the reciprocal (4,) but instead, she is just multiplying by .25.

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3 years ago

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