1 / 8

1-6 Writing Expression (pgs 29-32) 1-9 Using formulas (pgs 40-43)

1-6 Writing Expression (pgs 29-32) 1-9 Using formulas (pgs 40-43). 9P3:Describe problems using symbolic representation. What is the difference between an equation and an expression??? Expressions combination of variables, numbers, and operations. can be simplified by combining like terms

Download Presentation

1-6 Writing Expression (pgs 29-32) 1-9 Using formulas (pgs 40-43)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 1-6 Writing Expression (pgs 29-32)1-9 Using formulas (pgs 40-43) 9P3:Describe problems using symbolic representation

  2. What is the difference between an equation and an expression??? Expressions • combination of variables, numbers, and operations. • can be simplified by combining like terms (ex: 2xy + 4x +3 or 2a + 3a) Equations • two expressions that are equal. • Both sides have the same value. • Can be solved to find the value that works( most equations only have one number that makes them true. (ex: 2x +3 = 4x +5) ← x= -1 no other number works

  3. Things to note: • Watch subtraction problems: x - 2 is different than 2 – x • Remember your vocabulary… (What words mean + - ×÷) • Put the equal sign in the equation where you see the word is (or other forms such as has, had, was, were, etc.. )

  4. Which words/symbols mean + - ×÷ b

  5. Write an expression for the following 1) The sum of a number and 3 n + 3 2) three less than twice a number 2n - 3 3) 2 times the sum of 8 and a number 2(n+8) 4) Let s be Sue’s age. If Sue is 10 years older than Roy, write an expression for Roy’s age s - 10

  6. Use formula to solve problems • The speed of an airplane (a) is the Mach number (M) times the speed of sound (s). What equation represents this relationship? a=Ms If an airplane is traveling at Mach 1.5 and the speed of sound is 720mi/hr, what is the speed of the airplane? Step 1: write formula a =Ms Step 2: Substitute a =1.5*720mi/hr Step 3: simplify/label units a = 1080 mi/hr

  7. Assignment • 1-6/30/ 2-48eoe, 62-72 e • 1-9/42-43/ 2-22e, 26-34e

  8. Marker board Pg 30 3 23 25 31 39 43 45 67 71 Pg 42 3 13 17 27

More Related