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Compare Nonlinear Relationships
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GMAT
Q.148 Compare Nonlinear Relationships
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A table uses x = -1, 0, 1, 2 and y = 18, 6, 2, 2/3. Which relationship is shown?
A
Linear; the y-values decrease.
B
Quadratic; the second differences are negative.
C
Reciprocal; x*y is constant.
D
Exponential; each 1-unit x-step multiplies y by 1/3.
E
None; exponential models cannot have negative x-values.
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