What is the y intercept of the graph of the line given by the equation 3y+4x=15

When only separate discreet points are graphed it is called?

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!