Entry Exam Category: High School Equivalency Exams
Course: General Education Development (GED)
Exam: GED Math practice test
Practice Question
Which pair of equations represents parallel lines?
Answer Choices
- A: -2x + y + 2 = 0, y = -(1/2)x - 4
- B: 3x + y = -8, y = 3x - 8
- C: x + 2y = 8, -x - 2y = 3
- D: -(2/3)x + y = 12, y = -(3/2)x - 1
Correct Answer: C
Rationale: Parallel lines have equal slopes. Convert to slope-intercept form: C: x + 2y = 8 †’ y = -x/2 + 4, slope = -1/2; -x - 2y = 3 †’ y = -x/2 - 3/2, slope = -1/2. Slopes match, so the correct answer is x + 2y = 8, -x - 2y = 3.