Please have out notebook, pencil, white board marker Warm-up Translate the following into algebraic expressions 1.Eleven more than a number divided by.

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Presentation transcript:

Please have out notebook, pencil, white board marker Warm-up Translate the following into algebraic expressions 1.Eleven more than a number divided by 3. 2.Three increased by 12 times a number. 3.3 times the difference of a number and Half of a number plus 3. Remember to write out obj & prof & level

Answers to warm-up x / x 3.3(x-12) 4.x/2 + 3 OBJ: TO write alg expressions using # & variables & to use the order of operations

1.1 numbers & operations 4 Basic operations: 1.Addition: sum, added to, plus, increased by 2.Division: half of, quotient, divided by, split into 3.Subtraction: less, minus, decreased by, subtract, difference, taken away 4.Multiplication: times, product, doubled, multiplied by

1.2 Variables in Expressions Variable: a letter used to represent a number Value of the variable: the number the variable represents Algebraic expression: a collection of numbers, variables, operations, & grouping symbols. Evaluating an expression: solving the expression by inputting a number in for the variable(s)

Algebraic expression 8y 16a/b 4r + 2 Meaning 8 times y 16 times a then divide by b 4 times r then plus 2

Brain Break You have 10 seconds to get up & change seats w/someone across the room

3 simple steps to help you evaluate expressions correctly 1.Write the algebra expression4x 2.Substitute values for the variable(s). x = 2 4(2) 3.Simplify the numerical expression8

examples 5x + 4y, when x = 3 and y = 2 5x + 4ywrite the expression 5(3) + 4(2)substitute the #s = 23simplify X + (2x -1) when x = 3 X + (2x -1)write the expression 3 + (2*3 – 1)substitute the # 3 + (6 – 1)simplify = 8simplify

Algebraic equations used in real life Area of a rectangle A = LW If L = 4 cm and W = 14 cm, what is the area? A = 56 cm 2 Distance distance = rate(time) d = rt If a car travels 15 mph for 4 hours, how far did the car travel? D = 60 miles

White boards out

Try these 1. x – 9 when x = 21 2.xy when x = 3 and y = 2 3.Distance d = rt Rate = 60 mphtime = 2 hrs. 4.Area of a rectangle Answers 1)12 2)6 3)D = 120 Miles 4)A = 12 in 2 2 in. 6 in.

Any questions Homework Pg. 5 #15-23 odds Pg #7-19 odds