SAT Math Multiple Choice Question 369: Answer and Explanation

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Test Information

Question: 369

9. If a line that passes through the coordinates (a - 1, 2a) and (a, 6) has a slope of 5, what is the value of a?

  • A. -2
  • B.
  • C.
  • D. 2

Correct Answer: C

Explanation:

C

Difficulty: Medium

Category: Heart of Algebra / Linear Equations

Strategic Advice: Given two points (even when the coordinates are variables), the slope of the line is

Getting to the Answer: You are given a numerical value for the slope and a pair of coordinate points with variables. To find the value of a, plug the points into the slope formula, and then solve for a.

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