exam Maths Puzzle Numerical Ability

Solve the system by substitution
2x+2y=0
y=4x+0

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exam Other Question

y=4x; y=4x-17 I need help.
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find the parametric equations for line passing through the points P(5,-2,4) Q(7,2,-4).
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show that if v is a nonzero vector, then v/ llvll is a unit vector