Lemma
EasyCurves in space
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §12.1 The Position Vector, #7 · Multivariable Calculus · Curves in space

Find parametric equations for the line through … and

Find parametric equations for the line through and . Probably your speed is 5; change the equations so the speed is 10. Probably your is ; change the start to .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §12.1 The Position Vector, #7

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