Which expression gives the y-coordinate of the solution of the system? {5x+3y= -18 {2x- 4y= -28}

For this case we have the following system of equations:
 
 We can rewrite the system of equations to clear the variable y.
 We have then:
 
 Adding both equations we have:
 
 
 An expression that gives the y-coordinate of the solution of the system is:
 

3 ( y+6 ) = 10( 7-y ) is the answer.

Step-by-step explanation:

The given equations are 5x + 3y = -18 and 2x - 4y = -28

We have to find the expression that gives the coordinate of the solution of the system.

5x + 3y = -18

       5x = 18 - 3y

        x = -----------(1)

2x - 4y = -28

       x  = -2y = - 14

       x = -14 + 2y

       x = -2 (7 - y) ----------(2)

Now we will equate both the equations (1) and (2)

- ( y + 6 ) = -2 ( 7-y )

3 ( y+6 ) = 10( 7-y )

Therefore, 3 ( y+6 ) = 10( 7-y ) is the answer.

D.  x = 4.

Step-by-step explanation:

As the 2 angles are congruent:

2.3x +25 = 5.8x + 11

2.3x - 5.8x = 11 - 25

-3.5x = -14

x = 14/3.5

x = 4.