2.4 variables and equations                                September 12, 2011       Distribute.                     Simpli...
2.4 variables and equations                                     September 12, 2011      equation - mathematical sentence w...
2.4 variables and equations                               September 12, 2011       open sentence - equation with one or mo...
2.4 variables and equations                  September 12, 2011      Write an equation for      Nine times the opposite of...
2.4 variables and equations     September 12, 2011      Write an equation for      twenty minus x is three      Is this T,...
2.4 variables and equations                                       September 12, 2011    solution of an equation - a value ...
2.4 variables and equations                     September 12, 2011      Is the given number a solution of the equation?   ...
2.4 variables and equations                  September 12, 2011        A divers equipment weighs 35 lb.        The diver p...
2.4 variables and equations             September 12, 2011                         HW: pg 82 #1-35 oddsHW pg. 1­35 odds   ...
2.4 variables and equations                                        September 12, 2011      Page 82 # 2 ­ 22 even, 27 ­ 40 ...
2.4 variables and equations                                            September 12, 2011     P 78 # 1­ 3, 11 ­ 26 all, 32...
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  1. 1. 2.4 variables and equations September 12, 2011 Distribute. Simplify Bellwork 1. -3(x - 7) 3. -3(x - 7)+ 2x 2. (4 + c)8 4. 4 + 8c - 5 Objective - classify types of equationsHW pg. 1­35 odds 1
  2. 2. 2.4 variables and equations September 12, 2011 equation - mathematical sentence with an equal sign Types of equations well see: 9 + 2 = 11 numerical expression = numerical expression x + 7 = 37 variable expression = numerical expression a + (-3) = 2a + 5 variable expression = variable expressionHW pg. 1­35 odds 2
  3. 3. 2.4 variables and equations September 12, 2011 open sentence - equation with one or more variables State whether each equation is true or false, and open sentence. 6 + 12 = 18 6=4+3 6 = - 3 + 5yHW pg. 1­35 odds 3
  4. 4. 2.4 variables and equations September 12, 2011 Write an equation for Nine times the opposite of five is forty-five. Is this T, F, or open?HW pg. 1­35 odds 4
  5. 5. 2.4 variables and equations September 12, 2011 Write an equation for twenty minus x is three Is this T, F, or open?HW pg. 1­35 odds 5
  6. 6. 2.4 variables and equations September 12, 2011 solution of an equation - a value of a variable that makes an equation true. Is 30 a solution of the equation 170 + x = 200?HW pg. 1­35 odds 6
  7. 7. 2.4 variables and equations September 12, 2011 Is the given number a solution of the equation? 8 + t = 2t; 1HW pg. 1­35 odds 7
  8. 8. 2.4 variables and equations September 12, 2011 A divers equipment weighs 35 lb. The diver plus the equipment weighs 165 lb. Can the divers weight be 200 lb?HW pg. 1­35 odds 8
  9. 9. 2.4 variables and equations September 12, 2011 HW: pg 82 #1-35 oddsHW pg. 1­35 odds 9
  10. 10. 2.4 variables and equations September 12, 2011 Page 82 # 2 ­ 22 even, 27 ­ 40 all, 51 ­ 53 all 2  open 31  true, 12 = 12 4  open 32  open 6  open 33  (­20)(9) = ­11, false; ­180 = ­ 11 8  open 34  15 + n = 60; open 10  4(­5) = ­20, true, ­20 = ­20 12  yes 35  48 ÷ 12 = 3; false 4 ≠ 3 14  yes 36  No; an expression is not a sentence 16  no 37  yes, ­9 = ­9 18  no 38  no 14 ≠ 2 20  yes 39  no ­ 6 ≠ 6 22  850 + x = 1,200 40  yes; 2 = 2 27  true, 18 = 18 51  16 28  false, 48 = 108 52  0 29  open 30  ture, 10 = 10 53  8HW pg. 1­35 odds 10
  11. 11. 2.4 variables and equations September 12, 2011 P 78 # 1­ 3, 11 ­ 26 all, 32, 35     coef,      like,        constant 1  3, 5        none   ­3 2  2       none           ­7 3  4, ­7, 3  4x, ­7x, 3x    none 11  13a 12  13a 23  ­60 + 54k 13  ­b 24  ­4r + 3 14  6w 25  ­5a ­ 12 15  8r ­ 5 26  3 16  9a ­ 3 32  4p + 10 + 3, or 4p + 13 17  5g + 15 35  The variables are not separated  18  5z + 8y 19  ­m + 4d       by a plus or minus sign 20  3t + 1 21  11z + 8y 22  4HW pg. 1­35 odds 11

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