Do we need to pass college to be able to be a substitute

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

Find the midpoint m of z1=(8+5i) and z2=(12+3i)