1. Algebra 1 1.1 Variables in Algebra

2. VOCAB Variable - A letter used to represent a range of numbers Value - The numbers a variable represents Variable Expression - A symbolic form made up of constants, variables, and operations Numerical Expression - An expression that represents a particular number Evaluate - Find the value of an expression by substituting a specific numerical value for each variable, and simplifying the result

3. What does my expression mean? EXPRESSION MEANINGOPERATION 24/t24 divided by tdivision 8y8 times yMultiplication 13-n13 minus nsubtraction (4) (z)4 times zmultiplication 10 + x10 plus xaddition 24*y24times ymultiplication 16/b16 divided by bDivision

4. Evaluate Expression 24·y for y = 2 24/t for t = 3 24 + z for z = 36 13-n for n = 8 4(z) for z = 12

5. Evaluate Expression 24·y for y = 2 24/t for t = 3 24 + z for z = 36 13-n for n = 8 4(z) for z = 12 24 x 2 = 48 24 / 3 = 8 24 + 36 = 60 13 - 8 = 5 4(12) = 48

6. D = RT Distance = Rate * Time

7. With D=RT, evaluate the following expressions A train travels at a rate of 75 miles per hour for 2 hours. How far did the train travel? An athlete runs at a rate of 8 feet per second for 5 seconds. How far did the athlete run?

8. How far did I run? 20 yards 40 yards

9. Perimeter To find perimeter of a geometric figure, add the lengths of all the sides

10. Find the perimeter of the two figures 12in 12in. 4 feet 3 feet 5 feet

11. Area of a triangle A = (1/2)bh Base (b) - can be any side Height (h) - perpendicular to the base and goes to the highest point

12. Find the area! 4 ft 6 ft 10 ft 6 in 8 in