Question x-y-6-

1.1 Linear Functions - Slope calculation and interpretation
0:00
x y
-6 n + 184
-3 n + 92
0 n

The table shows three values of x and their corresponding values of y , where n is a constant, for the linear relationship between x and y . What is the slope of the line that represents this relationship in the xy-plane?

A.

- 92 3

B.

- 3 92

C.

n+92-3

D.

2n-923

x y - 6 n + 184 - 3 n + 92 0 n The table

Hard-difficulty · SAT Math · Linear Functions — Slope calculation and interpretation. 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. The slope, m , of a line in the xy-plane can be found using two points on the line, x1,y1 and x2,y2, and the slope formula m=y2-y1x2-x1. Based on the given table, the line representing the relationship between x and y in the xy-plane passes through the points -6,n+184, -3,n+92, and 0,n, where n is a constant. Substituting two of these points, -3,n+92 and 0,n, for x1,y1 and x2,y2, respectively, in the slope formula yields m=n-n+920--3, which is equivalent to m=n-n-920+3, or m=-923. Therefore, the slope of the line that represents this relationship in the xy-plane is - 92 3 .

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.