VARIABLES AND EXPRESSIONS INTRO TO ALGEBRA AND GEOMETRY Angela Farris 2015

I can write and simplify expressions.

VARIABLES A variable is a letter or symbol used to represent an unknown value.

ALGEBRAIC EXPRESSION An expression such as 5m + 6 An algebraic expression contains at least one variable and at least one mathematical operation.

TRANSLATE PHRASES INTO ALGEBRAIC EXPRESSIONS 35 more than the number of tickets sold The difference of six times a number and 10

EVALUATE EXPRESSIONS Let’s Do it! x – y + 6 if x = 27 and y = 12 Substitution Property of Equality Replace a variable with a number

EVALUATE EXPRESSIONS Let’s Do IT! X = 3, y = 4, and z = 7 6 y – 4 x ( z - x ) y 5 z + ( x + 4 y ) - 15

USE EXPRESSIONS TO SOLVE PROBLEMS East Middle School sold tickets for a school play. The price of an adult ticket was $3, and the price of a student ticket was $1. A.Write an expression that represents the total amount of money collected. B.Suppose 70 adult tickets and 85 student tickets were sold. How much money was collected? 3a + 1s $295