13 - 5
-2 - (-6)
=
8
4
=
2
Y2-Y1
X2-X1
constant of variation = unit rate
30
y = 30x
y = 30x
y = 30(6)
y = $180
Y2-Y1
X2-X1
$1.30
$3.90
-->
1
3
1.3(6)
Y2-Y1
X2-X1
Y2-Y1
X2-X1
You pick any 2 ordered pairs, so
PICK THE POSITIVE ONES!
Makes your life easier! :)
Y2-Y1
X2-X1
or 2.5
2.5(100) = $250
Rise
Run
Down is
negative!
Y2-Y1
X2-X1
=5
4g
15 g
=
$16.80
x
Rise
Run
1g
15 g
=
$4.20
x
4.2(15)
Y2-Y1
X2-X1
$63
0
-2
0