Respuesta :

If you're trying to find the value of x,

3x = 7y + 9

If value of y,

-7y = -3x +9

=

7y = 3x - 9
If you're solving for y it has to be this way
-7y=-3x+9
Y=3/7x -9/7
If you're solving for x
3x=7y+9
X=3/7y+3/1
RELAXING NOICE
Relax