Slope of a line parallel to the line through (4, −2) and (−3, 5) What is the slope of any line parallel to the line joining (4, −2) and (−3, 5)?
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A3/7
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B1
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C-3/7
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D-1
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ENone of these
Answer
Correct Answer: -1
Explanation
Introduction / Context:Parallel lines share the same slope. Compute the slope of the given line from two points, then use that value directly for any parallel line.
Given Data / Assumptions:
- Points: (x1, y1) = (4, −2), (x2, y2) = (−3, 5)
- Slope m = (y2 − y1) / (x2 − x1)
Concept / Approach:Compute m once; all parallels have identical m. Take care with signs in numerator and denominator for accuracy.
Step-by-Step Solution:
m = (5 − (−2)) / (−3 − 4) = 7 / (−7) = −1Verification / Alternative check:Reversing point order gives the same slope: (−2 − 5)/(4 − (−3)) = −7/7 = −1, confirming consistency.
Why Other Options Are Wrong:3/7 and −3/7 reflect partial differences; 1 is the negative inverse (perpendicular), not parallel.
Common Pitfalls:Sign mistakes in the denominator are common; always subtract coordinates in the same order for x and y.
Final Answer:−1