Download Aim: How do we solve literal equations? Do Now: Evaluate 1. Find t

Aim: How do we solve literal equations?
Do Now: Evaluate
1. Find t where d= r t 1­2 Literal Equations.
A‐REI.1
­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
2
Ex. A = 1 b h
2
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
,b
...let's try a couple more...
solve for the indicated variable
Ex. 5
Ex. 6
,b
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
Fahrenheit
temp. in terms of Celsius temp. Then find the Fahrenheit
temp. when the Celsius temp. is 30 degrees.
C = 5 (F ­ 32)
9
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
the
temp. is 60 degrees?
F = n + 37
4
Ex. 9