Classroom Finding a Solution from a Giver.
A Write the word statement as an equation. Use x as the variable. Then find all solution of the equation from the set (0, 2, 4, 6, 8, 10). Three times a number is subtracted from 21, giving 15. 21 —3x = 15 Substitute each of the given numbers. The solution is 2, because 21 — 3(2) = 15.
Equations and Expressions An expression is a phrase that represents a number. 4x + 5 (expression)
An equation is a sentence—it has something on the left side, an = symbol, and something on the right side.
4x + 5 = 9 (equation)
Evaluating Algebraic Expressions Evaluate each expression for p 3.
a. 16p — 8
b. 2p’
111 Using Variables to Write Word Phrases as Algebraic Expressions Write each word phrase as an algebraic expression using x as the variable.
a. A difference of 48 and a number. 48 — x
b. The product of 6 and a number 6x
c. 9 multiplied by the sum of a number and 5 9(x + 5) U=========111=1
Identify Solutions
