Question

Is this proportional? Explain why.

X=
HOURS
Y=
COST
1
3
Ordered pair
(x,y)
(1,3)
(2,6)
(4,12)
(5,15)
2
6
4
12
5
15

Answer 1

Yes

Explanation:

It's because it's all multiplied by 3. y=3x

Answer 2

yes

Explanation:

The graph will be proportional if y/x is equal to a constant

3/1 =3

6/2 = 3

12/4 = 3

15/5=3

Since they are all equal to the same constant

The equation for the line is of the form

y = kx or y = 3x

This is proportional