Download The triangle has area A. Write and solve an equation to

Objective: students will know how to rewrite equations and formulas.
Reminders: 1. Be sure you know where your homework is.
2. Set up Cornell notes. Work the warm up problems.
3. You are only allowed to talk to your teammates ­ you are only allowed to talk about the warm up problems.
4. Teams not following the directions will lose points on their grade.
5. Teams following the directions will add points on to their grade.
Stay on task!
Warm up:
1. 5x + 3(2x ­ 8) = 9
2. 7x ­ 3(3x + 4) = 4x ­ 2
Oct 6­3:04 PM
Objective: students will know how to rewrite equations and formulas..
The triangle has area A. Write and solve an equation to find the value of x.
x
16 cm
A = 72 cm2
Oct 6­3:08 PM
1
Objective: students will know how to rewrite equations and formulas..
The rectangle has area A. Write and solve an equation to find the value of x.
x
12 in.
A = 54 in2
The perimeter of the rectangle is 144. Write and solve an equation to find the value of x and find the length of each piece.
x + 7
3x ­ 2
Oct 6­3:08 PM
Objective: students will know how to rewrite equations and formulas.
Literal equations or formulas ­ have more than one letter.
Computers can help us solve problems if we can rearrange the formula for the desired letter.
Example: Every student is asked to hike a 2 mile trail and time how long it takes them. We want to calculate the walking rate of each student.
Formula: distance = (rate)(time)
d = rt
to save time the teacher solves the formula for 'r' and programs the computer to determine the rate for each hiker.
the computer asks each student how many minutes did they take. When the student enters the number, it evaluates the re­written formula and tells the student their rate.
1. solve the equation d = rt for 'r'
Oct 6­3:08 PM
2
Objective: students will know how to rewrite equations and formulas.
In the next chapter we will be studying the formula for a line. It is ax + by = c (a, b and c will be numbers). It is very important that we be able to get 'y' by itself. This is also called writing 'x' as a function of 'y'
Solve each equation for 'y'
1. 2x + 3y = 6
2. ­5x + 3y = ­30
3. ­4x ­2y = ­12
4. 7x ­ y = 8
Oct 6­3:08 PM
Objective: students will know how to rewrite equations and formulas.
Solve each equation for 'y'
1. 18 = 5x ­ 3y
2. 5 + 7y = 3x + 8
Oct 6­3:08 PM
3
Assignment: p 187 #11 ­ 17 Homework: practice test worksheet­ Must be done by tomorrow. No chance to make up later.
Oct 6­7:59 PM
Oct 6­8:05 PM
4
Assignment: p 195 (48 ­ 59) total 11 problems
Oct 6­8:20 PM
5