2. A variable is an unknown quantity. For example: What goes in the box? 7 3 + 7 = 10 3 + ? = 10 10 = 10

3. Think of x as being a jar of jelly beans. X = So, 4x = We don’t know how many jelly beans are in the jar, so we give it a name, x. Suppose that there are 300 jelly beans in each jar, then x = 300. How many would be in 4 jars? X = 300 300 We have 4 x’s, so 4(300) =1200 300

4. Remember: Area = length * width Area = length * width Area = (x+2) * 3 Find the area of the rectangle. AREA = 3 ( x + 2 )

5. 3 ( x + 2 ) 3 ( x )+3 ( 2 ) 3x + 6 ♫ ♪ ♪ ♫ ♪ ♪

7. Terms: -x, 2x, 8Coefficients: -1, 2 Constant Term: 8 Like Terms: -x, 2x

9. How many chickens? How many Horses? How many pigs? 3 2 1

12. Pg. 99-100 5-40