Question

what is the y-intercept that goes through the points (-3, 0) and (3, -2)

Answer 1

y-intercept is when the equation intersects the y-axis, i.e. when x=0.
In this particular example, x=0 at the middle between the two given points,
M((-3+3)/2, (0-2)/2)=M(0,-1)