Mathematics

A student told to draw the graph of y = x2 + 4x – 6….

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: Option 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