Substitution Algebraic expressions are very often used to

Substitution

Algebraic expressions are very often used to describe a situation in general terms. This means that the expression has a variable that can change and the value of the expression depends on the input for this variable.

So what does Substitution mean? Substitution means variable with a Algebraic expressions are veryreplacing often used to a describe a situation in general terms. number. This means that the expression has a variable that can change and the You work depends out the resulting valuethen of the expression on thevalue input forof this variable. expression using the correct order of operations (BEDMAS).

Example Algebraic expressions are very often used to describe a situation in general terms. This means that the expression has a variable that can change and the value of the expression depends on the input for this variable.

More examples Algebraic expressions are very often used to describe a situation in general terms. 3 This means that the expression has a variable 4 that can change and the value of the expression depends on the input for this variable. 10 -3

What you need to be careful with!

Use formula and substitution applied to word (application) problems Fish and Chips order F = Number of pieces of Fish Our formula (rule) is 1) 2) 3) 4) 5) 6) $ = 2 F + 1. 5 C C = Number of scoops of Chips where $ = Total Cost spent How much does one piece of fish cost? How much does one scoop of chips cost? How much does 2 fish and 2 scoops of chips cost? 4 fish and 3 scoops? If I had spent $9. 00 what did I buy? If I spent $15. 00 what could I buy?