O 14 8 13 13 O-8+ 6i 15. Find the vertex for y - 42 - 82 -- 12. Use (67 - 4ac) from the quadratic formula 16+ vb- 4de 24 4a O (1, 16) O (16,-1) O (-16, -1) O (-1,0) O (1,-16) ) 16. Find the solution(s) to the systems of equations algebraically. Select all that apply