5
QuizMultiple Choice

Solving Quadratic Equations: Completing the Square — Unit test

Question 5 • Common Core Algebra I 2014 - MA3109 B-CR

Which represents the solution(s) of the system of equations, y = x2 – x + 1 and y = x? Determine the solution set by graphing.

Answer
A
(1, 1)
B
(0, 1) and (1, 1)
C
(0, 0) and (1, 1)
D
no solutions

Explanation

The solutions are the points where the two graphs intersect, so set their y-values equal: x² − x + 1 = x. Rearranging gives x² − 2x + 1 = 0, or (x − 1)² = 0, so x = 1 and then y = 1. The graphs meet only at (1, 1), which is choice A.

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