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