Understand Equations
Does ( x = 4 ) make the equation ( x + 6 = 10 ) true? Show or explain your thinking. (2 pts)
Yes. When you substitute x into the equation (4+6 does equal 10)
A number plus 9 equals 21. Write an equation and solve it
x + 9 = 21
x = 30
Three times a number is 27. Write an equation and solve
3x = 27
x = 9
A number is greater than 12
x > 12
Graph x < 11 on a number line
Watch the board
y-3 = 5
y = 8
x - 7 = 12
Solve for x
19 = x
y/5 = 6
Solve for y
y = 30
The number of minutes spent on homework is at most 45.
x ≤ 45
y ≥ 4
Graph the inequality
Watch
3x - 7 = 9
Does x = 5 make the equation true?
No
If x = 5 then 3(5) - 7 = 8, not 9
13 = x + 4
x = 9
3x = 18
x = 6
Jayde is not 12 years old.
Watch
The total cost of movie tickets depends on how many tickets you buy
Identify the independent and dependent variables
Dependent: cost of tickets
independent: amount of tickets
15 + 2y = 29
Does y = 7 make the equation true?
yes, 15 + 2(7) = 29
x + 9 = 27
x = 18
x/3 = 5
x = 15
Bryan worked at least 45 hours this week.
x ≥ 45
The number of miles traveled depends on the time spent driving.
Identify the independent and independent variables
Dependent: Number of miles
Independent: time spent driving
What does Miss Kuehn always say or do?
NA
x - 17 = 22
x = 39
5x = 45
x = 9
No more than 10 people are allowed on the elevator.
x ≤ 10
What has only two words but thousands of letters?
Post Office