Respuesta :

plug the equation equal to x in for the 2nd equation and it will be
6(-2y-6)+7y=9
múltiple 6 to the equation in the parenthesis
-12y-36+7y=9
add -12 and 7
-36-5y=9
add 36 to the other side
-5y=45
divide by -5
y=-9
Y equals negative nine!