4 years ago

2x + y = 10

Mathematics

1 answer:

Elza [17]4 years ago

8 0

Answer:

3x - y = 5

Step-by-step explanation:

2x + y = 10 | ×2

x - 2y = -5

4x + 2y = 20

x - 2y = -5

add

4x + x + 2y - 2y = 20 - 5

5x = 15

x = 15 : 5

x = 3

replace x

4(3) + 2y = 20

12 + 2y = 20

2y = 8

y = 8 : 2

y = 4

3x - y =

= 3(3) - 4

= 9 - 4

= 5

You might be interested in

6х + 4y + 2z = 32 3х - 3y - z = 19 3х + 2y + z = 32 x = ? y = ? z = ?

blsea [12.9K]

×=12

y=9

z=2 not sure I'm right

3 0

3 years ago

PLEASE HELP 10 POINTS

patriot [66]

Answer:

the answer would be 1.35

Step-by-step explanation:

8 0

3 years ago

A rope which is 10.3 centimeters long is cut into 4 pieces of equal length. Write an equation to find the length of

alexdok [17]

Answer: x = 10.3 ÷ 4

Step-by-step explanation: if we were to work this out forgetting about the equation it can be worked out by dividing the 10.3 by 4 to find the length of the pieces so, now to express it as an equation, we have to add x into our sum 4 × ? = 10.3 : 4x = 10.3. The answer for x would be x = 2.58.

3 0

3 years ago

Read 2 more answers

What is equivalent to 5/40

Mnenie [13.5K]

Is it a multiple choice question? I mean, 10/80?..

3 0

4 years ago

Read 2 more answers

GEOLOGY Shan used a surveying tool to map a region of land for his science class. To determine the height of a vertical rock for

atroni [7]

17 i think! :]