Direct Variation
What is the formula for direct variation?
y=kx
What is the formula for inverse variation?
y=k/x
How do you know when to use an open or closed circle when graphing on the number line?
Closed= less than/greater than or equal to
Open=less than or greater than
What is slope intercept form?
y=mx+b
What is the fastest land animal?
Cheetah
What does the "k" stand for in direct variation?
Constant of variation
Inverse variation means, if one goes down, the other goes....?
Up
How do you know what direction to draw the arrow?
Whichever direction the inequality is pointing to, that is the direction you draw the arrow
Find the slope of a line that passes through the points (2,0) and (1,3).
-3
How old is the Earth?
4.5 Billion years old
If x varies directly as y, and x = 27 when y = 6, find x when y = 2.
9
If x varies inversely as y. If x =12 when y =4, what is the value of y when x = 16?
3
Solve, open/closed, which direction? 2x – 5 > 1
x>3 open circle, right
Look at graph on the board
-5/4
Who was the first Disney princess with a tattoo?
Pocahontas
If y varies directly as x, and y = - 4 when x = 32, find y when x = 3.
-3/8
If x varies inversely as y, and x = 9 when y = 8, find x when y = 12
6
Solve, open/closed, direction: 9x – 7 ≤ 38
x≤5, closed circle, left
Look at graph on the board
0
How many bones does a shark have?
0
If y varies directly as x, and y = 6 when x = 10, find x when y = 18.
30
If x varies inversely as y and x = 4 when y = 8, find x when y = 1.
32
When do we flip the inequality sign?
When you multiply/divide by a negative number
Find the slope equation of this graph:
y=x-4
What is the hottest planet?
Venus