EasyCurves in space

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

The line … passes through the origin provided _ …+ _

The line $x = 1 + v_{1} t, y = 2 + v_{2} t$ passes through the origin provided _____ $v_{1}$ + _____ $v_{2} = 0$ . This line crosses the $4 5^{\circ}$ line $y = x$ unless _____ $v_{1}$ + _____ $v_{2} = 0$ .

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

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The line … passes through the origin provided _____ …+ _____

The line … passes through the origin provided _ …+ _