What is the solution to this system of linear equations?

x + y = 4

x − y = 6

(4,6)
(6,4)
(5,-1)
(-1,5)

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x -4 0 for x? cos -3+ v (3) 2-4() 2(5) 3+ |(3)² +4() 205) 3+ (3) 2-4() -3+ v (3)² +4()