kemicknlolMath kemicknlolMath 28-12-2016 Mathematics contestada Which of the following has a graph that is a straight line? Equation 1: y = 4x3 + 6 Equation 2: y = 5x - 4.5 Equation 3: y2 = x - 1 Equation 4: y = 2x2 + 6