Answer
slope: -3
y-intercept: (0, -n)
Work Step by Step
First lets solve for y:
2y+4n=-6x (Subtract 4n to both sides)
2y=-6x-2n (Divide both sides by 2)
y=-3x-n
-3 is the slope because that is the number that is being multiplied with x and -n is the y-intercept because that is the constant that is being added to the x-term.