3 years ago

What is x + y = 12 if x = 2y

Mathematics

2 answers:

Crazy boy [7]3 years ago

5 0

I believe the answer is 4.

Ahat [919]3 years ago

4 0

Answer:

x=8

y =4

Step-by-step explanation:

x + y = 12 if x = 2y

Replace x with 2y in the first equation

2y+y = 12

Combine like terms

3y =12

Divide by 3

3y/3 =12/3

y = 4

Now we can find x

x=2y

x=2(4)

x = 8

You might be interested in

A box of pencils costs $3.25 and a box of colored pencils costs $4.65. However, a box of pencils and a box of colored pencils ar

ale4655 [162]

Answer:

the least is 40

Step-by-step explanation:

if u multiply each money amount times the amount they bought you get the awnser

3 0

3 years ago

Equation Practice with vertical angles <br><br><br>Please solve for x

Harrizon [31]

Answer:

x=20

Step-by-step explanation:

These angles are vertical angles so they are equal.

7x-99 = 2x+1

Subtract 2x from each side

7x-2x -99 = 2x-2x+1

5x -99 =1

Add 99 to each side

5x-99+99 = 1+99

5x = 100

Divide each side by 5

5x/5 =100/5

x = 20

5 0

3 years ago

Brianna went into a bakery and bought 2 cookies and 3 brownies, costing a total of $9.50. Nevaeh went into the same bakery and b

Ivenika [448]

Answer:

Step-by-step explanation:

c=cookies

b=brownies

2c+3b=9.50 > Briana

10c+6b=20.50 > Nevaeh

7 0

2 years ago

Mr. Roble is traveling to the store and drives 4 miles in 16 minutes. Write a unit rate that describes Mr. Roble's trip to the s

Fittoniya [83]

Answer: 4 miles = 16 min

4 miles : 16 min

Step-by-step explanation:

You have to multiply by the same number

3 0

3 years ago

Factor x2 + 16 completely.

Dmitry_Shevchenko [17]

<h3>Answer:</h3>

Prime

<h3>Solution:</h3>

Let's factor this expression.
x^2+16
The expression is prime.
Let's see why all the other options are wrong.
Option A) (x+4)(x+4)
x*x
x*4
4*x
4*4
This makes x^2+8x+16, not x^2+16.

Hope it helps.

Do comment if you have any query.

6 0

2 years ago

Read 2 more answers