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Welcome Back!!! Algebra Comprehensive Today is a A-day! (I think...) Ja nuary 2, 2012 PowerPoint Presentation
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Welcome Back!!! Algebra Comprehensive Today is a A-day! (I think...) Ja nuary 2, 2012. HAPPY NEW YEAR!!!!. Title: Solving Literal Equations/Evaluating Formula's. Warm-up: Solve the following proportions:. 1. 2. A car travels 125 miles in 3 hours. How far would it travel in 5 hours?.

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Presentation Transcript
slide1

Welcome Back!!!

Algebra Comprehensive

Today is a A-day! (I think...)

January 2, 2012

HAPPY NEW YEAR!!!!

slide2

Title: Solving Literal Equations/Evaluating Formula's

Warm-up:

Solve the following proportions:

1.

2.

A car travels 125 miles in 3 hours. How far would it travel in 5 hours?

Jane wants to make a doll that is a replica of a friend. The scale that she will use is 1 centimeter

on the doll will represent 2 inches on her friend. Her friend’s foot measures 8.5 inches. What will

be the size of the doll’s foot?

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Literal Equation: when the coefficients and constants have been replaced by variables.

Ex.) ax + b = c

Example 1: Solve the equation above for x. Then use the solution to solve 2x + 5 = 11

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You try!

1.) Solve the literal equation for x. Then use the solution to solve the equation.

a - bx = c 12 - 5x = -3

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Example 3:

The area A of a triangle is given by the formula A = ½bh where b is the base and h is the height.

a.) Solve the formula for the height h.

b.) Substitute 64.4 for A and 14 for b in the rewritten formula. Solve for the height.

slide9

You try!

1.) Write 5x + 4y = 20 so that y is a function of x.

2.) The perimeter P of a rectangle is given by the formula

P = 2L + 2w where L is the length and w is the width.

a.) Solve the formula for the width w.

b.) Use the rewritten formula to find the width of the rectangle shown.

P = 19.2 ft.

w

7.2 ft.

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Challenge:

A pet store sells aquariums that are rectangular prisms. The volume V of an aquarium is given by the formula V=lwh where l is the length, w is the width, and h is the height.

a. Solve the formula for h.

b. Use the rewritten formula to find the height of an aquarium shown, which has a volume of 5850 cubic inches.

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Classwork:

Fun with Formula's WS

and

Formula's in Action WS

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Homework:

Pgs. 187-189

7, 19, 20, 26, 27, 33, 36