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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 (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 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.. ) Which words/symbols mean + - × ÷ + - × plus minus times difference product and from at added to less double, greater than less than triple, etc. more than twice increased by fewer than decreased by of (fractions &%) total take away × • ( ) ab Sum + ÷ quotient of goes into per divided by ÷ a a/b b 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 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 Assignment 1-6/30/ 2-48eoe, 62-72 e 1-9/42-43/ 2-22e, 26-34e Marker board Pg 30 3 23 25 31 39 43 45 67 71 Pg 42 3 13 17 27