Literal Equations and Formulas 2 5 Vocabulary Literal
Literal Equations and Formulas (2 -5)
Vocabulary Literal Equation- An equation that involves two or more variables Formula- an equation that states a relationship among quantities
Rewriting a Literal Equation One pizza costs $10 You have $80 One sandwich costs $5 How many sandwiches can you buy if you get 3 pizzas? 6 pizzas? 1 st: Define your variables: p = # of pizzas s = # of sandwiches
2 nd : Write the equation 10 p + 5 s = 80 3 rd: Ask yourself, What do I want to know? The # of sandwiches I can buy 4 th: Isolate the variable that represents what you want to know 10 p + 5 s = 80 (Use inverse operations to get the s by itself)
10 p + 5 s = 80 -10 p 5 s = 80 – 10 p 5 5 5 th: Subtract 10 p from both sides of the equation 6 th: Now divide both sides by 5 s = 16 – 2 p 7 th: How can we determine the number of sandwiches if we buy 3 pizzas? -by substituting 3 in for p
s = 16 – 2 p s = 16 – 2(3) s = 16 – 6 s = 10 sandwiches How many sandwiches can you buy with 6 pizzas? 4 sandwiches
Literal Equations with only Variables Solve V = bwh for height V = bwh bw bw V = h bw
You try: Go to textbook pg 110 Write each formula and solve for the following: Perimeter: solve for w Circumference: solve for r Area (rect): solve for l Area (triangle): solve for b Area (circle): solve for r Distance: solve for t Temperature: solve for F Area (trapezoid): solve for base 2
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