Equations with fractions

NOTE: Sometimes it is not necessary to find the L.C.M of the denominators. If the equation has a single denominator on both sides of the equation, we simply solve the equation by cross multiplying as illustrated in the next example below.

FRACTIONS WITH BINOMIAL DENOMINATORS

CLASS ACTIVITY

1. Subtract 8 from 78, then find one-seventh of the result
2. If I add 8 to a certain number and I double the result, my final answer is 36. What is the number?

FORMULAE AND SUBSTITUTION

Formulae are equations containing variables that stand for specific quantities. The varibles are usually represented by letters.

Substitution means to replace one letter or a set of letters in an algebraic expression or formula with their numerical values in order to evaluate it.

EXAMPLE:

ASSIGNMENT

Solve the following equations