3 years ago

2x + 4y =450 4x + 2y = 420

Mathematics

1 answer:

masya89 [10]3 years ago

7 0

2x+4y=450

2x=450-4y

x=450-4y÷2----- equation 1

4x+2y=420

4x=420-2y

x=420-2y÷4----- equation 2

putting the value of x in equation 1

x=450-4y÷2

420-2y÷4=450-4y÷2

2(420-2y)=4(450-4y)

840-4y=1800-16y

840-1800=-16y-4y

-960= -12y

y=80

putting the value of y in equation1

2x+4y=450

2x+4×80=450

2x+320=450

2x=450-320

2x=130

x=130÷2

x=65

<h2> the value of x is 65 and y is 80</h2>

You might be interested in

6/7 divided by 3 help meh fast

leonid [27]

6/7 divided by 3
6/7 times 1/3
6/21
3/7

8 0

3 years ago

Read 2 more answers

Help. How to solve9d + n = 5r

coldgirl [10]

We want to rewrite the following equation

$9d+n=5r$

With d as a function of the other terms. Let's start by subtracting n from both sides.

$\begin{gathered} 9d+n-n=5r-n \\ 9d=5r-n \end{gathered}$

Now, let's divide both sides by 9.

$\begin{gathered} \frac{9d}{9}=\frac{5r-n}{9} \\ \\ d=\frac{5r-n}{9} \end{gathered}$

And this is our final answer.

7 0

1 year ago

Factor: a^5+2a+a^4+2.

Fudgin [204]

(A+1) (a^4+2) that’s my answer

3 0

3 years ago

A restaurant has 100 tables and 28 of the tables seat 2 people and 72 of the tables seat 4. What percentage of the tables seat 4

KiRa [710]

The percentage would be 72.

5 0

3 years ago

Ronna ordered 3 T-shirts for $15.67 each and one skirt for $24.55z what is the shipping, using the table below

Nina [5.8K]

Answer:

6.25

Step-by-step explanation:

4 0

3 years ago

2x + 4y =450 4x + 2y = 420​

2x + 4y =450 4x + 2y = 420