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Aim: How do we solve literal equations?
Do Now: Evaluate
1. Find t where d= r t 1­2 Literal Equations.
­copy aim & do now
­complete do now
­put a HW problem on the board.
for d = 60 miles and r = 30 mi/hr
2. Find l
where P = 2l + 2w for P = 32 cm and w = 5 cm
HW Problems on the Board
­write the problem
­work out problem
­circle answer
­write your name
Literal Equations
Literal Equation ­ is a equation containing 2 or more variables
To solve a literal equation, you just solve the equation for the indicated variable
Ex.1 d = r t
Ex. A = 1 b h
solve for r
solve for b
...sometimes the variable to be solved for is indicated with a comma before it...
Ex. 3 y = 3x + 2 Ex. 4 ab ­ d = c ,x
...let's try a couple more...
solve for the indicated variable
Ex. 5
Ex. 6
solve for x
Real World Problem Solving
Ex. 7
The formula gives the Celsius temp. C in terms of
Fahrenheit temp. Transform the formula to find
temp. in terms of Celsius temp. Then find the Fahrenheit
temp. when the Celsius temp. is 30 degrees.
C = 5 (F ­ 32)
Ex. 8
You can use the number of chirps (n) a cricket makes in one
minute to estimate the outside temp. F in degrees Fahrenheit.
Transform the formula to find the number of chirps in terms of
temp. How many chirps per minute per minute can you expect if
temp. is 60 degrees?
F = n + 37
Ex. 9