A student told to draw the graph of y = x2 + 4x - 6. He is then told to draw a liner 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 E. x + y = 1
Correct Answer: C
Explanation
The linear equation will be the difference between the equation. y=x2 + 4x - 6 and x2 + 4x - 7 = 0 y=x2 + 4x - 6, ( 0 = x2 + 4x - 7) y = -(-1) y = 1
