Substitution how do u do it??

3x-(2x+7) = -9 <=> x -7 = -9 <=> x = -2; y = 2(-2) + 7 = 3.

Answered by crisforp | 2024-06-10

In chemistry, substitution refers to a reaction where one or more atoms or groups of atoms replace another atom or group of atoms in a molecule. This can happen in various types of reactions, such as the substitution of a halogen atom for a hydrogen atom in alkyl halides. An example of a substitution reaction is the reaction between ethane and molecular chlorine, where a hydrogen atom in ethane is replaced by a chlorine atom:
CH3CH3 + Cl2 → CH3CH2Cl + HCl

Answered by RodStewart | 2024-06-18

Substitution in mathematics involves replacing a variable in an equation with another expression derived from a different equation. This method helps solve systems of equations efficiently. The process includes identifying equations, substituting, simplifying, and back-substituting to find variable values.
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Answered by RodStewart | 2025-06-16