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1-1 Variables and Expressions variable- a letter that stands for a number *In Algebra we will write products involving variables without the multiplication symbol Ex. 5t means 5 t 12y means 12 y * Be sure to always write the variable second Numerical Expression Two or more numbers combined with operations signs (there is no equals sign) Ex. 4 + 6 8 - 4 14 2 Variable ExpressionAn expression with one or more variables Ex. 3y m + 5 -16 r Drag each expression to the correct box Numerical Variable w 9 5y y+2 56 - x 3m + 7 12 2 32- 5 3 2 4+8 Write a variable expression for each word phrase. 1.) Nine more than a number y 2.) 4 less than a number n 3.) A number z times 3 4.) 8 more than 5 times a number t 5.) A number q divided by 7 Write an expression for each 1.) Vicki and Tamra are working on their math homework together. Vicki has worked p problems and Tamra has worked 4 times as many as Vicki. Write an expression to show how many problems they have worked altogether. 2.) Frank had 3b baseball cards and his brother had b baseball cards. They combined their cards, and then gave away 2b cards. Write an expression to shows how many they have left. 1-3 Variables and Expressions To evaluate a variable expression, replace each variable with the given number. Use proper the proper order of operations. Evaluate when x = -5 and y = 6 1.) 3x 2.) xy 3.) 12 + x + y 4.) 4y +9 Evaluate when x = 5 and y = 6 5.) 12 6.) 6(x+y) y 7.) 3y2 + 2x 8.) 2x+3y 7