If r(x, y) = 0.4, u = 2x + 3 and v = −3y + 1, what is r(u, v)?
Correct answer A. −0.4
Explanation
Changes of origin do not affect r, and scale factors affect only its sign. Since the multipliers 2 and −3 have opposite signs, r(u, v) = −0.4.
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