Class Notes Example Problems For C1 L6 Variables And Expressions

Variables and Expressions Glencoe Mathematics Course 1 1-6 Problem Examples Expression

kst – 53 + a ÷ 6

Variables (letters of alphabet)

k, s, t, a

Numbers

53, 6

Operations +, -, ÷, or × signs Remember, if something is smushed together, there is an invisible × sign there. ×, +, ÷

Evaluate an expression means find the final answer. They will tell you in the bold instructions what each variable (mystery number) is. Example: x = 3 and y = 5 for all the following expressions. a. x + y 3+5= 8 b. x × y 3×5= 15 c. x2 + 4 32 + 4= 9+4= 13 d. x2 + y2 32 + 5 2 = 9 + 52 = 9 + 25 = 34 e. 7x + 8y × 2 7×3+8×5×2= 21 + 8 × 5 × 2 = 21 + 40 × 2 = 21 + 80 = 101 f. 6xy 6×x×y= 6×3×5=

32 = 3 × 3 = 9

32 = 3 × 3 = 9 52 = 5 × 5 = 25

18 x 5 = 90