Solve x=y x+3y=12?

Answer 1

x = y
x + 3y = 12
x + 3x = 12
4x = 12
x = 3
y = x = 3

Answer 2

fairly straight forward. you recognize x = y + 8, so which you will "substitute" that for the time of for x interior the 2d equation and resolve for y. 5x + 3y = 12 5* (y + 8) + 3y = 12 (5y + 40) + 3y = 12 8y + 40 = 12 8y = -28 y = -28/8 y = -7/2 you may now substitute this value of y decrease back into the unique equation and resolve for x: x = y + 8 x = -7/2 + 8 x = -7/2 + sixteen/2 x = 9/2 So x = 9/2, y = -7/2. completed.

Answer 3

Substitute Y for x in the X+3Y=12 to read

4y=12
divideby 3 and get Y=4
then since x=y, x is also equal to 3

QED.

Answer 4

x = y = 3

Answer 5

Equations: x = y and x + 3y = 12

First: "x" has been isolated for us in the 1st equation > replace "y" with the "x" variable in the 2nd equation >

y + 3y = 12

Sec: combine "like" terms >

4y = 12

Third: solve for "y" by isolating it on one side > divide both sides by 4 >

4y/4 = 12/4
y = 3

Fourth: replace "3" with the "y" variable in the 1st equation >

x = y
x = 3

(3, 3)

Answer 6

x=y solve the equation x+3y=12...

since x and y are equal x+3y=12 can be written as x+3x=12
Therefore:

x+3x=12

(4x=12)/4

x = 3

Answer 7

x=y

x+3y=12 substitute
y+3y=12
4y=12
y=3
x=y=3
(3, 3)

Answer 8

If x=y and x+3y=12
x+3x=12
Therefore 4x=12
and x=3

Answer 9

x=y
x+3y=12
Thus x+3x=12
4x=12
x=3
Since x=y, if x=3 then y=3
Answer is x=3,y=3

Answer 10

x=y,
y+3y=12
4y=12
y=3
Thus, x=3