SAT Math Multiple Choice Question 352: Answer and Explanation
If the equation of the line shown in the figure above is written in the form which of the following could be the value of m?
- A. -3
- D. 3
Correct Answer: C
Category: Heart of Algebra / Linear Equations
Strategic Advice: The slope-intercept form of a line is y = mx + b. In this question, the graph passes through the origin, so b is 0.
Getting to the Answer: Because b is 0, the equation of this line in slope-intercept form is y = mx, which can be rewritten as . Count the rise and the run from the origin, (0, 0), to the next point, (3, 1), to get a slope of .