What would this look like in an equation in slope intercept form?

through (-3,4) and (3,-4)

Would it be Y=4/3x+0 ??

m = (y2-y1)/(x2-x1)

(-4-4)/(3-(-3)
m =-8/6 = -4/3

y = mx + b
4 = (-4/3)(-3) + b
4 = 4 + b
b = 0

y = -4/3 x