Algebra 1 1.1 Variables in Algebra. VOCAB Variable - A letter used to represent a range of numbers Value - The numbers a variable represents Variable.

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Presentation transcript:

Algebra Variables in Algebra

VOCAB Variable - A letter used to represent a range of numbers Value - The numbers a variable represents Variable Expression - A symbolic form made up of constants, variables, and operations Numerical Expression - An expression that represents a particular number Evaluate - Find the value of an expression by substituting a specific numerical value for each variable, and simplifying the result

What does my expression mean? EXPRESSION MEANINGOPERATION 24/t24 divided by tdivision 8y8 times yMultiplication 13-n13 minus nsubtraction (4) (z)4 times zmultiplication 10 + x10 plus xaddition 24*y24times ymultiplication 16/b16 divided by bDivision

Evaluate Expression 24·y for y = 2 24/t for t = z for z = n for n = 8 4(z) for z = 12

Evaluate Expression 24·y for y = 2 24/t for t = z for z = n for n = 8 4(z) for z = x 2 = / 3 = = = 5 4(12) = 48

D = RT Distance = Rate * Time

With D=RT, evaluate the following expressions A train travels at a rate of 75 miles per hour for 2 hours. How far did the train travel? An athlete runs at a rate of 8 feet per second for 5 seconds. How far did the athlete run?

How far did I run? 20 yards 40 yards

Perimeter To find perimeter of a geometric figure, add the lengths of all the sides

Find the perimeter of the two figures 12in 12in. 4 feet 3 feet 5 feet

Area of a triangle A = (1/2)bh Base (b) - can be any side Height (h) - perpendicular to the base and goes to the highest point

Find the area! 4 ft 6 ft 10 ft 6 in 8 in