Chapter 3 All About Equations!. 3.1 and 3.2 Addition and Multiplication Property of Equality.

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Presentation transcript:

Chapter 3 All About Equations!

3.1 and 3.2 Addition and Multiplication Property of Equality

The Addition Property of Equality if a = b, then a + c = b + c

x + 7 = 2 Show your work exactly like this: Write the problem: Add same number to both sides of “=“: Write answer with box around it - 7 x = -5

The weekly rent on an apartment was increased by $82. The new rental cost is $675. What is the previous rent? Let x = the previous rent. x + 82 = x = 593

A number is increased by 36 is 15. Find the number. Let x = the original number. x + 36 = x = -21

A number decreased by 83 is 46. Find the number. Let x = the original number. x - 83 = x = 129

The Multiplication Property of Equality For all rational numbers a, b, and c If a = b, then ac = bc

Solve: 5x = 30 Show your work exactly like this tonight

Solve: -12x = -8

To solve an equation like: Multiply both sides of the equation by the reciprocal of the coefficient

Solve:

Kayla bought 12 identical bowling balls. They weighed a total of 90 pounds. How much did each ball weigh? Let b= the weight of one ball

Penny bought a 12-bottle case of juice on sale for $6.72. What was the price of each bottle? Let j= the cost of one juice bottle

Assignment: Workbook Page 15 (1-20) all *Do on a separate sheet of paper *Title your paper *Write the problem *Show all work *Highlight answers