PRE-ALGEBRA. Lesson 1-3 Warm-Up PRE-ALGEBRA To evaluate an algebraic expression, replace the varaibles (letters) with the numbers they equal and solve.

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PRE-ALGEBRA

Lesson 1-3 Warm-Up

PRE-ALGEBRA To evaluate an algebraic expression, replace the varaibles (letters) with the numbers they equal and solve using PEMDAS. Writing and Evaluating Expressions (1-3) How do you evaluate an algebraic expression? Example: Evaluate 4y - 15 for y = 9 4 (9) - 15Step 1: Replace the variable with the number equals Step 2: Solve using order of operations [PEMDAS] 21 Example: Evaluate 3ab + c /2 for a =2, b = 5, and c = 10 3(2)(5) + 10 / 2 Step 1: Replace the variable with the number it equals Step 2: Solve using order of operations [PEMDAS] 35

PRE-ALGEBRA Evaluate g for g = g = (3)Replace g with 3. = Multiply. = 24Add. Writing and Evaluating Expressions LESSON 1-3 Additional Example

PRE-ALGEBRA Evaluate 2ab – for a = 3, b = 4, and c = 9. = 24 – 3Multiply and divide from left to right. = 21 Subtract c3c3 2ab – = 2(3)(4) –Replace the variables. c3c3 (9) 3 Writing and Evaluating Expressions LESSON 1-3 Additional Example

PRE-ALGEBRA Example: An online store charges $14 for each CD and $6 per order. How much would it cost to order 8 CDs? Number of CD s Cost of CD s Shipping Total Cost 1 1 x x = = x x = = x x = = x x = = 118 Step 1: Create a table to find the pattern (see above). n x Step 2: Write an expression using the pattern (8) x Step 3: Replace the variable with the number it equals Step 4: Solve using order of operations [PEMDAS] 118 Writing and Evaluating Expressions (1-3)

PRE-ALGEBRA The Omelet Café buys cases of 36 oranges. a.Write an algebraic expression for the number of cases the Café should buy for x oranges. b.Evaluate the expression for 180 oranges. a. x oranges b. 180 oranges x 36 = Evaluate for x = 180. (180) 36 x 36 = 5Divide. The Omelet Café should buy 5 cases to get 180 oranges. Writing and Evaluating Expressions LESSON 1-3 Additional Example

PRE-ALGEBRA The One Pizza restaurant makes only one kind of pizza, which costs $16. The delivery charge is $2 per delivery. Write an algebraic expression for the cost of having pizzas delivered. Evaluate the expression to find the cost of having two pizzas delivered. $2 delivery charge = number of pizzas. Words for each Let $16 p pizzaplus Evaluate the expression for p = p + 2 = 16 (2) + 2 = = 34 It costs $34 to have two pizzas delivered. Expression 16 p2+ Writing and Evaluating Expressions LESSON 1-3 Additional Example

PRE-ALGEBRA Evaluate. 1.7(b) – 4 for b = 3 2.h ÷ for h = c + 4 ÷ d for c = 8, d = 24.fg – g for f = 5, g = 7 5. Pens are sold at the school store in packages of 4. Write an algebraic expression for the number of packages a student should buy to get p pens. Evaluate this expression for 12 pens p 4 = 3 packages ; Writing and Evaluating Expressions LESSON 1-3 Lesson Quiz