A student is told to draw the graph of y = x2 + 4x – 6. He is then told to draw a linear graph on the same axis such that the intersection of the two graphs will give the solutions to the equation x2 + 4x – 7 = 0. What is the equation of the linear graph he needs to draw?
A. x = 1
B. x = - 1
C. y = 1
D. y = - 1
Pls include working