3 years ago

If 2x + 5y = 21 and x + y = 3, then what is the value of x?

Mathematics

2 answers:

statuscvo [17]3 years ago

5 0

Answer:

Step-by-step explanation:

Given the 2 equations

2x + 5y = 21 → (1)

x + y = 3 → (2)

Rearrange (2) expressing y in terms of x, by subtracting x from both sides

y = 3 - x ← Substitute into (1)

2x + 5(3 - x) = 21 ← distribute and simplify left side

2x + 15 - 5x = 21

- 3x + 15 = 21 ( subtract 15 from both sides )

- 3x = 6 ( divide both sides by - 3 x = - 2 → D

Bumek [7]3 years ago

5 0

The answer in the math is D

You might be interested in

Algebra 1 Honors

Paul [167]

Answer:

19200

brainliest if correct

Explanation

12% of 120,000 = 14400

14400x7 = 100800

120,000 - 100800 = 19200

8 0

3 years ago

Can you help me with this assignment

slamgirl [31]

Where what assignment are you talking about

8 0

3 years ago

Read 2 more answers

Hello I was wondering if you can help me list these from least to greatest

netineya [11]

Answer:

See below.

Step-by-step explanation:

Convert to decimal form

7 3/5 = 7.6

7 7/10 = 7.7

10 2/5 = 10.4

8 1/2 = 8.5

So the answer is

7 3/5 , 7 7/10, 8.3, 8.1/2, 10.2 10 2/5, 11.1.

8 0

4 years ago

The volume of a sphere is given by V = (4/3)πr3 , where r is the radius. what is the formula in terms of r

guajiro [1.7K]

the answer is r = ∛(3V/4Π)

7 0

3 years ago

Please help it's urgent!

jeka57 [31]

Means just trust me I did it

3 0

3 years ago

Read 2 more answers