Respuesta :

AnimeBrainly
follow the ax + by + c formula

ax = -3x (because both has x)
by =  y 
c =  7 (it is the constant)

-3x + y + 7 is your answer

follow the y = mx + b formula

2y = 6x + 12

2(y) = 2(x + 6)
y = x + 6 is your answer

hope this helps