Algebra 1 Section 1.1 Evaluate algebraic expressions

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Presentation transcript:

Algebra 1 Section 1.1 Evaluate algebraic expressions A variable is a symbol (letter) used to represent a number. x, y, z, Θ, φ, α Variable (algebraic) Expression x+ 2y 3z 9 + 6w

Evaluate the expression To evaluate an algebraic expression Substitute the value in the variable Simplify the expression 6x when x = 12 6w + 4 when w = 8

Evaluate the expression. 3a + 2b when a = 5, b = 4, and c = -2 c

Formulas use variables Simple Interest I = P·r·t I = interest P = principle r = interest rate t = time Find the simple interest on a principle of $2000 when invested at a rate of 6% per year for 3 years.

D =R·T Distance Formula D=distance R=rate T=time How far can you hike at a speed of 3 miles per hour in 2.5 hours?

Find the average speed of a car that travels 150 miles in 2.5 hours. R = D T

Assignment Page 6 Problems 20-40 even, 43-47 all, 62-68 even