Ada draws the graph of y = x2 – x – 2 and y = 2x – 1 on the same axes. Which of these equations is she solving?
- x2 - x - 3 = 0
-
x2 - 3x - 1 = 0
- x2 - 3x - 3 = 0
- x2 + 3x - 1 = 0
The correct answer is: B
Explanation
Given; y = x2 - x - 2, y = 2x - 1Using y = y, gives
x2 - x - 2 = 2x - 1
x2 - 3x - 2 + 1 = 0
therefore, x2 - 3x - 1 = 0