Find the slope
What is the slope of (2,3) and (5,9)
2
Find the rate of change
X Y
1 3
2 5
3 7
4 9
Is it linear?
Rate of change: 2
Yes its linear
Write an ordered pair for x=3 and y=7
(3,7)
What equation do we use to find slope?
m= y2-y1 / x2- x1
Which teacher just moved to Massachusetts from Washington?
Ms.Robbins
Find the slope between (4,8) and (8,10)
1/2
X Y
0 6
2 10
4 14
6 18
2
yes linear
What coordinate comes first?
A. y
B. x
x
What letter represents slope?
m
Which teacher graduated from Emmanuel College?
Ms.Keane
Find the slope between (-1,5) and (2, -1)
-2
X Y
1 4
2 7
3 11
4 16
+3, +4, +5
No, not linear
Write the ordered pair:
x = -4
y = 8
(-4,8)
What equation do we use to find the y-intercept?
y= mx+b
Which teacher will be teaching at Talbot this fall?
Ms.Robbins
What equation do we use to find slope?
y= y2- y1 / x2- x1
X Y
2 9
4 15
6 21
8 27
3
Yes, linear
What is the x coordinate in (6,-2)
6
0
Which teacher graduated from Williams College?
Ms.Sam
True or false: If the denominator is 0, the slope is undefined
True
X Y
-2 5
0 1
2 -3
4 -7
-2
Yes, linear
What is the y coordinate in (-9,12)
12
The y-intercept
Which teacher shares the same birthday as her brother (8 years apart)?
Ms. Sam