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

WAEC 1988

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

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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

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