Section 3.3 Using Formulas

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Presentation transcript:

Section 3.3 Using Formulas Algebra Concepts Section 3.3 Using Formulas

Formula- equation that shows a relationship between variables

Has anyone seen this formula. 𝑑=𝑟×𝑡 What do the variables represent

Joey is training for running a marathon. He can run 7 miles per hour Joey is training for running a marathon. He can run 7 miles per hour. How far can he run in 3 hours? Rate = 7 miles/hour Time = 3 hours What are you trying to find?

Write the formula. Fill in the variables you know. Find the missing variable.

The number of times a cricket chirps is based on the temperature.

The formula relating temperature is 𝐹= 𝑛 4 +37 𝑛 𝑖𝑠 𝑡ℎ𝑒 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑐ℎ𝑖𝑟𝑝𝑠 𝑖𝑛 𝑜𝑛𝑒 𝑚𝑖𝑛𝑢𝑡𝑒 𝑎𝑛𝑑 𝐹 𝑖𝑠 𝑡ℎ𝑒 𝑑𝑒𝑔𝑟𝑒𝑒𝑠 𝐹𝑎ℎ𝑟𝑒𝑛ℎ𝑒𝑖𝑡

Estimate the temperature if the cricket is making 94 chirps per minute. Write the formula Substitute the variable you know Do the math!

𝐹= 𝑛 4 +37 𝐹= 94 4 +37 𝐹=23.5+37 𝐹≈61°

Perimeter- is the distance around a figure Perimeter for a rectangle is 𝑃=2𝑙+2𝑤 𝑙 𝑖𝑠 𝑡ℎ𝑒 𝑙𝑒𝑛𝑔𝑡ℎ 𝑎𝑛𝑑 𝑤 𝑖𝑠 𝑡ℎ𝑒 𝑤𝑖𝑑𝑡ℎ 𝑃 𝑖𝑠 𝑡ℎ𝑒 𝑝𝑒𝑟𝑖𝑚𝑒𝑡𝑒𝑟

Find the perimeter. 𝑃=2𝑙+2𝑤 𝑃=2 7 +2 4 𝑃=14+8 𝑃=22 𝑦𝑑𝑠. ALWAYS LABEL!!!!!

Area (of a plane figure)- is the inside shape or space measured in square units.

You could count up all the squares OR Use the formula 𝐴=𝑙𝑤

𝐴=𝑙𝑤 𝐴=9 4 𝑠𝑞𝑢𝑎𝑟𝑒𝑠 𝑦𝑜𝑢 𝑎𝑙𝑠𝑜 𝑛𝑒𝑒𝑑 𝑡ℎ𝑒 𝑠𝑖𝑧𝑒 𝑜𝑓 𝑡ℎ𝑒 𝑠𝑞𝑢𝑎𝑟𝑒𝑠 𝐴=36 𝑠𝑞. 𝑓𝑡. 𝑜𝑟 36 𝑓𝑡. 2

Now you can use any formula in Math!