Complete the point slope intercept equation of the line through (-4,8) and (4,4)

Each morning papa notes the birds feeding on his bird feeder. so far this month he has see. 59 blue jays, 68 black crows, 12 red robin's and 1 cardinal. what is the probability of a blue jay being the next bird papa sees

This is about circle theorems. someone asap : (

Using elimination, what is -4x+2y=-12 4x+8y=-24