SS1 First Term Mathematics Lesson Note – Simple Equations and Variations

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WEEK 9

SUBJECT: MATHEMATICS

CLASS: SS 1

TOPIC: Simple Equations and variations:

CONTENT:

• Formulae, substitution and Change of subject of formulae.
• simple binary operations.
• Variations (i) Direct and inverse, (ii) joint and partial.
• Application of variation.

SUBJECT OF A FORMULA

The subject of a formula is the variable that is expressed in term of the other variables. In the relation y=x+4, y is called the subject of the formula. To make x the subject means rewriting this relation in an equivalent form, where x will be alone on one side of the equality sign. The relation is normally written with the subject on the left-hand side of the formula. For example, y=2x-3 , the x can be made subject of formula as follows,  x = .

SUBSTITUTION

A formula is an equation in which letters represent quantities. The value of one variable in a formula or algebraic equation may be found by substituting (i.e replacing) known values in the same formula

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