Unit 2.3 Formulas and Problem Solving
Concepts: A formula is an equation that states a known relationship among multiple quantities
(has more than one variable in it).
A = lw
(Area of a rectangle = length · width)
I = PRT
(Simple Interest = Principal · Rate · Time)
d = rt
(distance = rate · time)
V = lwh
(Volume of a rectangular solid = length · width · height)
Objective 1: Solve a formula for a specified variable.
Lecture: Watch video 2.3
Notes:
Solve for n:
T = mnr
Solve for y:
3y – 2x = 7
Solve for T:
A = P + PRT
Prof: Gilberto J Palomino
Now try yourself!
Solve for P:
A = P + PRT
Solve for b: A  B  b h
1
2
Solve for r: A = P + Prt
Solve for h: A  B  b h
n
a  K 
2
Solve for B: A  B  b h
Solve for n:
S
1
2
1
2
Things to do:
1. Homework in MyMathLab. 2.3
Prof: Gilberto J Palomino