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Published byBuck Poole
Modified over 8 years ago
Organize Binders -Move ch. 3 notes to “old notes” -Move review sheet to “review” -Move Quiz to “quiz” -Throw away old homework
4-1 Ratios and Proportions Objective: To determine if two ratios are equal and to solve proportions. NEW STAMP LOG!
Vocabulary Ratio: A comparison of 2 numbers using division ▫Examples: Proportion: An equation stating that two ratios are equal ▫Examples:
Examples 1.Write the ratio of “x to y”. 2.If there are 12 cats and 4 dogs, write the ratio of: 1.Cats to Dogs 2.Dogs to Cats Sidenote: You can (and should) reduce a ratio!!!
Comparing Ratios To tell if two ratios are equivalent (create a proportion), find the cross product. 628822 168 176 ≠ Answer: Not a proportion
TOO: Is it a proportion? 1)2) Answers: 1)Yes 2)No
Proportion: We already know that the fractions are equal Solve the Proportion CROSS MULTIPLY No more fractions! (8)(3) = (4)(x)
TOO: Solve the proportion 1)2) Answers: 1)a = 9 2)y = -63/16
Example Cross Multiply Distribute Solve 5(x + 2) = (3)(6)
Try with me 1) 2) 3) Answers: 1) w = 5 2) x = -10 3) x = 9
TOO: Watch your Negatives!!! 1) 2) 3) Answers: 1) r = 3/5 2) y = -13/4 3) x = -7/4
Homework Pg. 199 # 14 - 34
3-5 Write Ratios & Proportions
3-6 Solve Proportions Using Cross Products
4-1 Ratios & Proportions.
Proportions A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal. 3 = 6 is an example of a proportion.
Ratios and Proportions
Can we go on! You have 5 minutes to complete check-up.
Ch. 7 Learning Goal: Ratios & Proportions
Writing and Solving Proportions. Proportions Proportion is an equation stating that two ratios are equivalent. Proportional are two quantities that form.
Using Cross Products Lesson 6-4. Cross Products When you have a proportion (two equal ratios), then you have equivalent cross products. Find the cross.
+ Cross Multiplication Objective: We will learn to use cross multiplication to solve a proportion. We will use cross multiplication to check whether two.
How do I solve a proportion?
Finding a Percent of a Number Lesson 6-7. Using a Proportion Set up a proportion that uses the percent over 100. Cross multiply to write an equation.
1-7 Solve Equations by Multiplying and Dividing. Ch. 1-7 Solving Equations by Multiplying & Dividing Steps to solve equation or isolate the variable:
7.1 Ratio and Proportion Textbook page 357.
PERCENT PROPORTIONS Using Proportions 4-1. Vocabulary Review Ratio: The comparison of two numbers (written in Algebra as a fraction) Proportion: When.
4.2 Solving Rational Equations 1/30/2013. Vocabulary Rational Equation: Equation that shows two rational expressions or fractions are equal. Example:
Objective Students will solve proportions Chapter 8, lesson 2 (8-2).
Proportions Objectives: 1) solve equations with variables in numerators 2) Solve equations with variables in denominators.
Warm up Lesson 3.1 Solve the following equations: 1. -5(3z + 7) = -8z 2. 3y + 12 = -(6 – 2y) 3. 8a = -4(5a + 7) 4. 10(3b – 1) = -2(b - 3) = z 2.
Proportions. Proportion – two equal ratios 1 = 4 3 = = 21 a = c 8 24 b d.
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