1 / 10

Intro to E xpressions a nd V ariables

Intro to E xpressions a nd V ariables. Expression. Expressions are made up of one or all of these: numbers (2 or 3 or 4) variables (x, y , or n) operations (+, − , x,/). Special Note on E xpressions . You cannot solve an expression You can write an equivalent expression, though!

liesel
Télécharger la présentation

Intro to E xpressions a nd V ariables

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. Intro to Expressions and Variables

  2. Expression Expressions are made up of one or all of these: • numbers (2 or 3 or 4) • variables (x, y, or n) • operations (+,−,x,/)

  3. Special Noteon Expressions... You cannot solve an expression You can write an equivalent expression, though! 2p+p is equivalent to 3p 4m+3m is equivalent to 7m

  4. Expression Examples 1 let A be the number of apples I have let B be the number of bananas. A+B expresses the _______________________________. B-A expresses ___________________________________.

  5. Expression Examples 2 Let C be the number of cheetos you eat each day. 3C would express_____________________ 7C would express_____________________

  6. Expression examples 3 Let p the number of pennies Let n be the number of nickles What could these expressions mean? 5n+p 6n+2p n+p Would an expression with any other operation besides adding make sense here?

  7. Coefficient Coefficients are the number part of the terms with variables. In 3x + 2y + 7xy + 5 the coefficient of the first term is 3 the coefficient of the second term is ___ the coefficient of the third term is _____

  8. Term A small part of an expression or equation (often separated by addition or subtraction) Example... in 3x+2 the terms are 3x and 2 What are the terms in: 4 + 2x + 7y 5x + 3 - 7 15 + 30 + 17 + 2y +3y

  9. Combining like terms... Combining Like Terms is a process used to simplify an expression or an equation using addition and subtraction of the coefficients of terms. Consider the expression below 5 + 7 By adding 5 and 7, you can easily find that the expression is equivalent to 12

  10. "like terms" How can we identify when a pair of terms are "like" . The following are like terms because each term consists of a single variable, x, and a numeric coefficient. 2x, 45x, x, 0x, -26x, -x Each of the following are like terms because they are all constants. 15, -2, 27, 9043, 0.6 Each of the following are like terms because they are all y2 with a coefficient. 3y2, y2, -y2, 26y2

More Related