Writing+the+equation,+given+three+pointsSet+6

Sarah Schwartz's Question: Create an equation for each set of points. Your equation must be in standard form. 1. (7,80) (2,15) (.5, 5.25) 2. (4,126) (1,15) (2, 38) 3. (5, -34) (-2,-1) (10,-109) Gilad Doron's answers: 1. x²+4x+3=y 2. 7x²+2x+6=y 3. -(6/7)x²-(15/7)x-(13/7)=y