Page 122 Transforming Formulas

1
Page 122 Transforming Formulas

• Students will use solve a formula for a given
  variable
• Use formulas to solve problems

2
Example

• Transforming in One step Solve the circumference
  formula C2pr for r.
• C2pr
• C2pr
• rC

2p
2p
2p
3
Example

• 2. Using more than one step Solve the perimeter
  formula P2l2w for w.
• P2l2w
• P-2l2l2w-2l
• P-2l2w
• (P-2l)(2w)
• P-lw

1
1
2
2
1
2
4
CA Standards Check

• Solve for the indicated variable
• Solve ps-c for s
• Solve h for k
• Solve Iprt for p

k
j
5
Example

• 3. Using Distance Formula You plan a 600-mi trip
  to New York City. You estimate your trip will
  take about 10 hours. To estimate your average
  sped, solve the distance formula drt for r. Then
  substitute to find average speed.
• drt
• drt
• r

600
r
10
t
t
r 60 mi/h
d
t
6
Ca Standards Check

• 2. Assume in example 3 your average speed is 50
  mi/h solve the solve the distance formula for the
  new t.

7
Homework

• Page 369 1-10 all