Which ordered pair is a solution of the equation? y = 7x - 3

A. Only (1,4)
B. Only (-1,-4)
C. Both (1,4) and (-1,-4)
D. Neither

Please explain/show work if you can. Whoever is correct gets brainliest :-)

What is best way to getting answer for my exam is

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 =

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?