Expressions 1
Write the expression for the sum of x and 8
x + 8
Write and expression to show seven squared.
72
6 x 7 - 12 + 33
57
What is the formula for a direct variation function
y = ax
x 1 2 3 4 5
y 5 10 15 20 15
What is the formula for this function? What kind of function is it? - bonus points
y = 5x - direct variation
Write the for the product of 6 and x.
6x
If 20 divided by x = 5, What does x equal
4
x3 - x2 if x = 10
900
What is the formula for a linear function?
y = ax + b
Give your neighbor a high five
:)
Write an expression that shows 9 subtracted from y.
y - 9
Solve 20x + 10 if x = 5
110
82/4 + 42/8
18
What kind of function is represented by the formula
y = a/x
Inverse Variation
What does the graph of a direct variation look like?
a straight line that starts at the origin
Subtract x from y, then square the result
What is the Perimeter and Area of a rectangle whose width is 8 cm and the length is y cm.
Perimeter = 16 + 2y cm
Area - 8y cm
Write an expression: Square 4 and then divide the result by 9
42 / 9
True or False: A direct variations are linear functions
True
True/False - The graph of every linear function intersects at the origin.
False
Add 5 to x, then multiply by 4
4(5 + x)
What is 64 as a power of 2?
26
Write an expression: Add 8+ 5, then multiply by 12
12(8+5)
In what kind of function will one variable triple when the other variable triples?
Direct Variation
The speed at which a certain ant travels is a function of the temperature. This table shows how the two variables are related.
Speed (cm/second) (x) 2 3 4 5
Temperature in Celsius (y) 16 22 28 34
1. What is the formula for this function?
2. How cold must it be for the ant to stay home?
1. y = 6x +4
2. 4 degrees Celsius because when the speed (x) = 0, then y = 4
y = 6 (0) +4... y = 4