The answer is
C. 1 1/2
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Hope This Helps!
The thing is that every 4 years, the tree grows 6 inches, so that could be expressed as a ratio, 4/6. That also means that every two years, the tree grows 3 inches since it could be simplified to 2/3.
y = -0.60x - 4
because the slope stays the same because it is parallel and the y intercept for the new equation ends up being -4