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Chapter 4 –Equations and Formulae Sections F and G –Working with Formulas

Bell Ringer : Farmer Giles walks down one side of his chicken coop and sees it is j ust 30cm less than 8 paces. He walks along the next side, taking 15 paces to arrive 25cm short of the end. He knows that the second side is twice as long as the first. How long is Farmer Giles’ pace?

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Chapter 4 –Equations and Formulae Sections F and G –Working with Formulas

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  1. Bell Ringer: • Farmer Giles walks down one side of his chicken coop and sees it is just 30cm less than 8 paces. He walks along the next side, taking 15 paces to arrive 25cm short of the end. He knows that the second side is twice as long as the first. • How long is Farmer Giles’ pace? • What are the dimensions of the chicken coop? Chapter 4 –Equations and FormulaeSections F and G –Working with Formulas ACT CCRS: A 601. Manipulate expressions and equations A 403. Solve routine first-degree equations

  2. Chapter 4 –Equations and FormulaeSections F and G –Working with Formulas Learning Intentions • Evaluate formulas using substitution • Develop formulas with a new subject ACT CCRS: • A 601. Manipulate expressions and equations • A 403. Solve routine first-degree equations

  3. DEF –A formula is any equation which relates two or more variables Which of the following formulas do you know by heart? Which can you research? (planner) • Area of a rectangle: • Perimeter of a rectangle: • Area of a circle: • Circumference of a circle: • Area of a triangle: • Volume of a rectangular prism: • Distance traveled: • Fahrenheit degrees to Celsius degrees:

  4. As you can see, it is common for one of the variables to be on one side of the equation by itself. DEF – The variable on its own is the Subject of the formula. If a formula contains two or more variables, and we know the value of all but one of them, we can use the formula to find the value of the unknown. LETS PRACTICE!!!

  5. Evaluate when it is 20° Celsius outside when it is 20° Fahrenheit outside when we have gone 325 miles in 6 hours.

  6. We may be required to rearrange a formula to make one of the other variables the subject. In other words, solve the formula for one of the other variables. Make t the subject of .

  7. Make c the subject of

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