1. 3 6 9 7 8 9 10 3 6 9 7 8 9 10

2. constant straight line origin constant
*The word constant means at the same rate of change.
straight line
origin
*The word origin means at point at (0,0).
constant

3.  ($25)(0) 0  ($25)(1) 25  ($25)(2) 50  ($25)(3) 75  ($25)(4) 100
 A straight monthly fee is sometimes referred to as a flat rate (no change)
 ($25)(0)
 ($25)(1)
 ($25)(2)
 ($25)(3)
 ($25)(4)
 ($25)(5) y
(input value) (output value)
 The slope is $25 ($25 per month)
 The slope (rise / run) is 25/1.
 YES. The table is proportional, as the rate of change each month is constant / not changing.
YES.
All points lie in a straight line. AND
The line passes through or begins at the origin (0,0).

4. y = 25x
The slope is 25. It is the coefficient in front of x.
They have a constant rate and pass through (0,0) with in a straight line.
y = mx
slope
x represents (input value) and y represents (output value)

5. y = 1.38x y=cost and x=pounds (apples)
The slope is 5.52/4 or $1.38 per pound
The rise/run is 4/3.
YES. $1.38 per pound is constant. Also, zero pound = zero cost.
YES. Slope is constant. Also, line passes through origin (0,0).
y = 1.38x y=cost and x=pounds (apples)
y = 4/3x

6. Origin Will not pass through (0,0).
not constant
Origin Will not pass through (0,0).
y-intercept
y-intercept: Ordered pair (0, y)
x must be zero when finding the y-intercept

7. 20(0)
20(1)
20(2)
20(3)
20(4)
20(x) y
Slope is 20.
Slope is 20/1.
y-intercept is 10, point at (0,10)
y-intercept is 10, point at (0,10)
No. ratio between x and y is not constant.
Line does not pass through the origin (0,0).

8. y = 20x + 10
The slope is the coefficient in front of x. The slope is 20.
The y-intercept is the number after x. The y-intercept is 10.
They have a y-intercept is not (0,0).
y = mx + b
slope
y-intercept

9. Line would begin at (0,12). Non-proportional.-4 9 no -8 no
1.25
yes
y = x
0.75 12
Line would begin at (0,12). Non-proportional.