Question the-li
- The line slants gradually down from left to right.
- The line passes through the following points:
- (negative 8 comma 4)
- (0 comma 2)
- (8 comma 0)
The graph of is shown. Which equation defines function ?
The line slants gradually down from left to right. The line passes through the following points:
Hard-difficulty · SAT Math · Linear Equations in Two Variables — Writing equations from data/points. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice A is correct. An equation for the graph shown can be written in slope-intercept form , where is the slope of the graph and its y-intercept is . Since the y-intercept of the graph shown is , the value of is . Since the graph also passes through the point , the slope can be calculated as , or . Therefore, the value of is . Substituting for and for in the equation yields . It’s given that an equation for the graph shown is . Substituting for in the equation yields . Subtracting from both sides of this equation yields .
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.
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