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Which one does NOT belong?

Exercise and reference answers

Questions
  1. Items
    1. Differentiation
    2. Substitution
    3. Elimination
    4. Cross multiplication
    Reason
    Differentiation belongs to calculus. The other three are methods of solving a pair of linear equations.
    Odd item
    Differentiation
  2. Items
    1. Intersecting lines
    2. Curved lines
    3. Parallel lines
    4. Coincident lines
    Reason
    A linear equation always graphs as a straight line, never a curve.
    Odd item
    Curved lines
Instructions
Tap the item that does not belong with the rest.

Explanation

_Source: syllabus Maths Ch3 Pair of Linear Equations, PAIR OF LINEAR EQUATIONS_
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