(04.04) Which of the following has a graph that is a straight line? (4 points) Equation 1: y = 4x3 + 6 Equation 2: y = 5x − 4.5 Equation 3: y2 = x − 1 Equation 4: y = 2x2 + 6

The equation of a straight line is in the form y = mx + c.
Among the 4 equations, it is only equation 2 that is in this form. 

The equation 2: y=5x-4.5 is the correct answer.