4x + 2y = 6
x-y=3
What’s the value of the x variable in this solution?

Hello!

Solve the system using substitution:

We can rearrange the second equation to find an expression for y:

x - y = 3

Subtract x from both sides:

-y = -x + 3

Multiply the equation by -1:

y = x - 3

Substitute this value of y into the first equation:

4x + 2y = 6

4x + 2(x - 3) = 6

Distribute:

4x + 2(x) + 2(-3) = 6

Simplify and combine like terms:

4x + 2x - 6 = 6

6x = 12

6x / 6 = 12 / 6

x = 2.

y = -1

Step-by-step explanation:

x - y = 3

x = 3 + y

4x + 2y = 6

substitute x for 3 + y

4(3+y) + 2y = 6

open the parenthesis

12 + 4y + 2y = 6

12 + 6y = 6

subtract 12 from both sides of the equation

12 - 12 + 6y = 6 - 12

6y = 6 - 12

6y = -6

divide both sides of the equation by 6

6y/6 = -6/6

y = -6/6

y = -1

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24